diff MoinMoin/support/parsedatetime/__init__.py @ 6098:83b1bc99457c

upgrade parsedatetime from 0.8.7 to 2.1
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Tue, 06 Sep 2016 00:09:31 +0200
parents 0a6fe22644e3
children
line wrap: on
line diff
--- a/MoinMoin/support/parsedatetime/__init__.py	Mon Sep 05 23:55:33 2016 +0200
+++ b/MoinMoin/support/parsedatetime/__init__.py	Tue Sep 06 00:09:31 2016 +0200
@@ -1,28 +1,2782 @@
-"""
-parsedatetime.py contains the C{Calendar} class where the C{parse()}
-method can be found.
-
-parsedatetime_consts.py contains the C{Constants} class that builds the
-various regex values using locale information if available.
+# -*- coding: utf-8 -*-
+#
+# vim: sw=2 ts=2 sts=2
+#
+# Copyright 2004-2016 Mike Taylor
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""parsedatetime
+
+Parse human-readable date/time text.
+
+Requires Python 2.6 or later
 """
 
-version = '0.8.7'
-author  = 'Mike Taylor and Darshana Chhajed'
-license = """
-Copyright (c) 2004-2008 Mike Taylor
-Copyright (c) 2006-2008 Darshana Chhajed
-All rights reserved.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-   http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-"""
-
+from __future__ import with_statement, absolute_import, unicode_literals
+
+import re
+import time
+import logging
+import warnings
+import datetime
+import calendar
+import contextlib
+import email.utils
+
+from .pdt_locales import (locales as _locales,
+                          get_icu, load_locale)
+from .context import pdtContext, pdtContextStack
+from .warns import pdt20DeprecationWarning
+
+
+__author__ = 'Mike Taylor'
+__email__ = 'bear@bear.im'
+__copyright__ = 'Copyright (c) 2016 Mike Taylor'
+__license__ = 'Apache License 2.0'
+__version__ = '2.1'
+__url__ = 'https://github.com/bear/parsedatetime'
+__download_url__ = 'https://pypi.python.org/pypi/parsedatetime'
+__description__ = 'Parse human-readable date/time text.'
+
+# as a library, do *not* setup logging
+# see docs.python.org/2/howto/logging.html#configuring-logging-for-a-library
+# Set default logging handler to avoid "No handler found" warnings.
+
+try:  # Python 2.7+
+    from logging import NullHandler
+except ImportError:
+    class NullHandler(logging.Handler):
+
+        def emit(self, record):
+            pass
+
+log = logging.getLogger(__name__)
+log.addHandler(NullHandler())
+
+debug = False
+
+pdtLocales = dict([(x, load_locale(x)) for x in _locales])
+
+
+# Copied from feedparser.py
+# Universal Feedparser
+# Copyright (c) 2002-2006, Mark Pilgrim, All rights reserved.
+# Originally a def inside of _parse_date_w3dtf()
+def _extract_date(m):
+    year = int(m.group('year'))
+    if year < 100:
+        year = 100 * int(time.gmtime()[0] / 100) + int(year)
+    if year < 1000:
+        return 0, 0, 0
+    julian = m.group('julian')
+    if julian:
+        julian = int(julian)
+        month = julian / 30 + 1
+        day = julian % 30 + 1
+        jday = None
+        while jday != julian:
+            t = time.mktime((year, month, day, 0, 0, 0, 0, 0, 0))
+            jday = time.gmtime(t)[-2]
+            diff = abs(jday - julian)
+            if jday > julian:
+                if diff < day:
+                    day = day - diff
+                else:
+                    month = month - 1
+                    day = 31
+            elif jday < julian:
+                if day + diff < 28:
+                    day = day + diff
+                else:
+                    month = month + 1
+        return year, month, day
+    month = m.group('month')
+    day = 1
+    if month is None:
+        month = 1
+    else:
+        month = int(month)
+        day = m.group('day')
+        if day:
+            day = int(day)
+        else:
+            day = 1
+    return year, month, day
+
+
+# Copied from feedparser.py
+# Universal Feedparser
+# Copyright (c) 2002-2006, Mark Pilgrim, All rights reserved.
+# Originally a def inside of _parse_date_w3dtf()
+def _extract_time(m):
+    if not m:
+        return 0, 0, 0
+    hours = m.group('hours')
+    if not hours:
+        return 0, 0, 0
+    hours = int(hours)
+    minutes = int(m.group('minutes'))
+    seconds = m.group('seconds')
+    if seconds:
+        seconds = seconds.replace(',', '.').split('.', 1)[0]
+        seconds = int(seconds)
+    else:
+        seconds = 0
+    return hours, minutes, seconds
+
+
+def _pop_time_accuracy(m, ctx):
+    if not m:
+        return
+    if m.group('hours'):
+        ctx.updateAccuracy(ctx.ACU_HOUR)
+    if m.group('minutes'):
+        ctx.updateAccuracy(ctx.ACU_MIN)
+    if m.group('seconds'):
+        ctx.updateAccuracy(ctx.ACU_SEC)
+
+
+# Copied from feedparser.py
+# Universal Feedparser
+# Copyright (c) 2002-2006, Mark Pilgrim, All rights reserved.
+# Modified to return a tuple instead of mktime
+#
+# Original comment:
+#   W3DTF-style date parsing adapted from PyXML xml.utils.iso8601, written by
+#   Drake and licensed under the Python license.  Removed all range checking
+#   for month, day, hour, minute, and second, since mktime will normalize
+#   these later
+def __closure_parse_date_w3dtf():
+    # the __extract_date and __extract_time methods were
+    # copied-out so they could be used by my code --bear
+    def __extract_tzd(m):
+        '''Return the Time Zone Designator as an offset in seconds from UTC.'''
+        if not m:
+            return 0
+        tzd = m.group('tzd')
+        if not tzd:
+            return 0
+        if tzd == 'Z':
+            return 0
+        hours = int(m.group('tzdhours'))
+        minutes = m.group('tzdminutes')
+        if minutes:
+            minutes = int(minutes)
+        else:
+            minutes = 0
+        offset = (hours * 60 + minutes) * 60
+        if tzd[0] == '+':
+            return -offset
+        return offset
+
+    def _parse_date_w3dtf(dateString):
+        m = __datetime_rx.match(dateString)
+        if m is None or m.group() != dateString:
+            return
+        return _extract_date(m) + _extract_time(m) + (0, 0, 0)
+
+    __date_re = (r'(?P<year>\d\d\d\d)'
+                 r'(?:(?P<dsep>-|)'
+                 r'(?:(?P<julian>\d\d\d)'
+                 r'|(?P<month>\d\d)(?:(?P=dsep)(?P<day>\d\d))?))?')
+    __tzd_re = r'(?P<tzd>[-+](?P<tzdhours>\d\d)(?::?(?P<tzdminutes>\d\d))|Z)'
+    # __tzd_rx = re.compile(__tzd_re)
+    __time_re = (r'(?P<hours>\d\d)(?P<tsep>:|)(?P<minutes>\d\d)'
+                 r'(?:(?P=tsep)(?P<seconds>\d\d(?:[.,]\d+)?))?' +
+                 __tzd_re)
+    __datetime_re = '%s(?:T%s)?' % (__date_re, __time_re)
+    __datetime_rx = re.compile(__datetime_re)
+
+    return _parse_date_w3dtf
+
+
+_parse_date_w3dtf = __closure_parse_date_w3dtf()
+del __closure_parse_date_w3dtf
+
+_monthnames = set([
+    'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul',
+    'aug', 'sep', 'oct', 'nov', 'dec',
+    'january', 'february', 'march', 'april', 'may', 'june', 'july',
+    'august', 'september', 'october', 'november', 'december'])
+_daynames = set(['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'])
+
+
+# Copied from feedparser.py
+# Universal Feedparser
+# Copyright (c) 2002-2006, Mark Pilgrim, All rights reserved.
+# Modified to return a tuple instead of mktime
+def _parse_date_rfc822(dateString):
+    '''Parse an RFC822, RFC1123, RFC2822, or asctime-style date'''
+    data = dateString.split()
+    if data[0][-1] in (',', '.') or data[0].lower() in _daynames:
+        del data[0]
+    if len(data) == 4:
+        s = data[3]
+        s = s.split('+', 1)
+        if len(s) == 2:
+            data[3:] = s
+        else:
+            data.append('')
+        dateString = " ".join(data)
+    if len(data) < 5:
+        dateString += ' 00:00:00 GMT'
+    return email.utils.parsedate_tz(dateString)
+
+
+# rfc822.py defines several time zones, but we define some extra ones.
+# 'ET' is equivalent to 'EST', etc.
+# _additional_timezones = {'AT': -400, 'ET': -500,
+#                          'CT': -600, 'MT': -700,
+#                          'PT': -800}
+# email.utils._timezones.update(_additional_timezones)
+
+VERSION_FLAG_STYLE = 1
+VERSION_CONTEXT_STYLE = 2
+
+
+class Calendar(object):
+
+    """
+    A collection of routines to input, parse and manipulate date and times.
+    The text can either be 'normal' date values or it can be human readable.
+    """
+
+    def __init__(self, constants=None, version=VERSION_FLAG_STYLE):
+        """
+        Default constructor for the L{Calendar} class.
+
+        @type  constants: object
+        @param constants: Instance of the class L{Constants}
+        @type  version:   integer
+        @param version:   Default style version of current Calendar instance.
+                          Valid value can be 1 (L{VERSION_FLAG_STYLE}) or
+                          2 (L{VERSION_CONTEXT_STYLE}). See L{parse()}.
+
+        @rtype:  object
+        @return: L{Calendar} instance
+        """
+        # if a constants reference is not included, use default
+        if constants is None:
+            self.ptc = Constants()
+        else:
+            self.ptc = constants
+
+        self.version = version
+        if version == VERSION_FLAG_STYLE:
+            warnings.warn(
+                'Flag style will be deprecated in parsedatetime 2.0. '
+                'Instead use the context style by instantiating `Calendar()` '
+                'with argument `version=parsedatetime.VERSION_CONTEXT_STYLE`.',
+                pdt20DeprecationWarning)
+        self._ctxStack = pdtContextStack()
+
+    @contextlib.contextmanager
+    def context(self):
+        ctx = pdtContext()
+        self._ctxStack.push(ctx)
+        yield ctx
+        ctx = self._ctxStack.pop()
+        if not self._ctxStack.isEmpty():
+            self.currentContext.update(ctx)
+
+    @property
+    def currentContext(self):
+        return self._ctxStack.last()
+
+    def _convertUnitAsWords(self, unitText):
+        """
+        Converts text units into their number value.
+
+        @type  unitText: string
+        @param unitText: number text to convert
+
+        @rtype:  integer
+        @return: numerical value of unitText
+        """
+        word_list, a, b = re.split(r"[,\s-]+", unitText), 0, 0
+        for word in word_list:
+            x = self.ptc.small.get(word)
+            if x is not None:
+                a += x
+            elif word == "hundred":
+                a *= 100
+            else:
+                x = self.ptc.magnitude.get(word)
+                if x is not None:
+                    b += a * x
+                    a = 0
+                elif word in self.ptc.ignore:
+                    pass
+                else:
+                    raise Exception("Unknown number: " + word)
+        return a + b
+
+    def _buildTime(self, source, quantity, modifier, units):
+        """
+        Take C{quantity}, C{modifier} and C{unit} strings and convert them
+        into values. After converting, calcuate the time and return the
+        adjusted sourceTime.
+
+        @type  source:   time
+        @param source:   time to use as the base (or source)
+        @type  quantity: string
+        @param quantity: quantity string
+        @type  modifier: string
+        @param modifier: how quantity and units modify the source time
+        @type  units:    string
+        @param units:    unit of the quantity (i.e. hours, days, months, etc)
+
+        @rtype:  struct_time
+        @return: C{struct_time} of the calculated time
+        """
+        ctx = self.currentContext
+        debug and log.debug('_buildTime: [%s][%s][%s]',
+                            quantity, modifier, units)
+
+        if source is None:
+            source = time.localtime()
+
+        if quantity is None:
+            quantity = ''
+        else:
+            quantity = quantity.strip()
+
+        qty = self._quantityToReal(quantity)
+
+        if modifier in self.ptc.Modifiers:
+            qty = qty * self.ptc.Modifiers[modifier]
+
+            if units is None or units == '':
+                units = 'dy'
+
+        # plurals are handled by regex's (could be a bug tho)
+
+        (yr, mth, dy, hr, mn, sec, _, _, _) = source
+
+        start = datetime.datetime(yr, mth, dy, hr, mn, sec)
+        target = start
+        # realunit = next((key for key, values in self.ptc.units.items()
+        #                  if any(imap(units.__contains__, values))), None)
+        realunit = units
+        for key, values in self.ptc.units.items():
+            if units in values:
+                realunit = key
+                break
+
+        debug and log.debug('units %s --> realunit %s (qty=%s)',
+                            units, realunit, qty)
+
+        try:
+            if realunit in ('years', 'months'):
+                target = self.inc(start, **{realunit[:-1]: qty})
+            elif realunit in ('days', 'hours', 'minutes', 'seconds', 'weeks'):
+                delta = datetime.timedelta(**{realunit: qty})
+                target = start + delta
+        except OverflowError:
+            # OverflowError is raise when target.year larger than 9999
+            pass
+        else:
+            ctx.updateAccuracy(realunit)
+
+        return target.timetuple()
+
+    def parseDate(self, dateString, sourceTime=None):
+        """
+        Parse short-form date strings::
+
+            '05/28/2006' or '04.21'
+
+        @type  dateString: string
+        @param dateString: text to convert to a C{datetime}
+        @type  sourceTime:     struct_time
+        @param sourceTime:     C{struct_time} value to use as the base
+
+        @rtype:  struct_time
+        @return: calculated C{struct_time} value of dateString
+        """
+        if sourceTime is None:
+            yr, mth, dy, hr, mn, sec, wd, yd, isdst = time.localtime()
+        else:
+            yr, mth, dy, hr, mn, sec, wd, yd, isdst = sourceTime
+
+        # values pulled from regex's will be stored here and later
+        # assigned to mth, dy, yr based on information from the locale
+        # -1 is used as the marker value because we want zero values
+        # to be passed thru so they can be flagged as errors later
+        v1 = -1
+        v2 = -1
+        v3 = -1
+        accuracy = []
+
+        s = dateString
+        m = self.ptc.CRE_DATE2.search(s)
+        if m is not None:
+            index = m.start()
+            v1 = int(s[:index])
+            s = s[index + 1:]
+
+        m = self.ptc.CRE_DATE2.search(s)
+        if m is not None:
+            index = m.start()
+            v2 = int(s[:index])
+            v3 = int(s[index + 1:])
+        else:
+            v2 = int(s.strip())
+
+        v = [v1, v2, v3]
+        d = {'m': mth, 'd': dy, 'y': yr}
+
+        # yyyy/mm/dd format
+        dp_order = self.ptc.dp_order if v1 <= 31 else ['y', 'm', 'd']
+
+        for i in range(0, 3):
+            n = v[i]
+            c = dp_order[i]
+            if n >= 0:
+                d[c] = n
+                accuracy.append({'m': pdtContext.ACU_MONTH,
+                                 'd': pdtContext.ACU_DAY,
+                                 'y': pdtContext.ACU_YEAR}[c])
+
+        # if the year is not specified and the date has already
+        # passed, increment the year
+        if v3 == -1 and ((mth > d['m']) or (mth == d['m'] and dy > d['d'])):
+            yr = d['y'] + self.ptc.YearParseStyle
+        else:
+            yr = d['y']
+
+        mth = d['m']
+        dy = d['d']
+
+        # birthday epoch constraint
+        if yr < self.ptc.BirthdayEpoch:
+            yr += 2000
+        elif yr < 100:
+            yr += 1900
+
+        daysInCurrentMonth = self.ptc.daysInMonth(mth, yr)
+        debug and log.debug('parseDate: %s %s %s %s',
+                            yr, mth, dy, daysInCurrentMonth)
+
+        with self.context() as ctx:
+            if mth > 0 and mth <= 12 and dy > 0 and \
+                    dy <= daysInCurrentMonth:
+                sourceTime = (yr, mth, dy, hr, mn, sec, wd, yd, isdst)
+                ctx.updateAccuracy(*accuracy)
+            else:
+                # return current time if date string is invalid
+                sourceTime = time.localtime()
+
+        return sourceTime
+
+    def parseDateText(self, dateString, sourceTime=None):
+        """
+        Parse long-form date strings::
+
+            'May 31st, 2006'
+            'Jan 1st'
+            'July 2006'
+
+        @type  dateString: string
+        @param dateString: text to convert to a datetime
+        @type  sourceTime:     struct_time
+        @param sourceTime:     C{struct_time} value to use as the base
+
+        @rtype:  struct_time
+        @return: calculated C{struct_time} value of dateString
+        """
+        if sourceTime is None:
+            yr, mth, dy, hr, mn, sec, wd, yd, isdst = time.localtime()
+        else:
+            yr, mth, dy, hr, mn, sec, wd, yd, isdst = sourceTime
+
+        currentMth = mth
+        currentDy = dy
+        accuracy = []
+
+        debug and log.debug('parseDateText currentMth %s currentDy %s',
+                            mth, dy)
+
+        s = dateString.lower()
+        m = self.ptc.CRE_DATE3.search(s)
+        mth = m.group('mthname')
+        mth = self.ptc.MonthOffsets[mth]
+        accuracy.append('month')
+
+        if m.group('day') is not None:
+            dy = int(m.group('day'))
+            accuracy.append('day')
+        else:
+            dy = 1
+
+        if m.group('year') is not None:
+            yr = int(m.group('year'))
+            accuracy.append('year')
+
+            # birthday epoch constraint
+            if yr < self.ptc.BirthdayEpoch:
+                yr += 2000
+            elif yr < 100:
+                yr += 1900
+
+        elif (mth < currentMth) or (mth == currentMth and dy < currentDy):
+            # if that day and month have already passed in this year,
+            # then increment the year by 1
+            yr += self.ptc.YearParseStyle
+
+        with self.context() as ctx:
+            if dy > 0 and dy <= self.ptc.daysInMonth(mth, yr):
+                sourceTime = (yr, mth, dy, hr, mn, sec, wd, yd, isdst)
+                ctx.updateAccuracy(*accuracy)
+            else:
+                # Return current time if date string is invalid
+                sourceTime = time.localtime()
+
+        debug and log.debug('parseDateText returned '
+                            'mth %d dy %d yr %d sourceTime %s',
+                            mth, dy, yr, sourceTime)
+
+        return sourceTime
+
+    def evalRanges(self, datetimeString, sourceTime=None):
+        """
+        Evaluate the C{datetimeString} text and determine if
+        it represents a date or time range.
+
+        @type  datetimeString: string
+        @param datetimeString: datetime text to evaluate
+        @type  sourceTime:     struct_time
+        @param sourceTime:     C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of: start datetime, end datetime and the invalid flag
+        """
+        rangeFlag = retFlag = 0
+        startStr = endStr = ''
+
+        s = datetimeString.strip().lower()
+
+        if self.ptc.rangeSep in s:
+            s = s.replace(self.ptc.rangeSep, ' %s ' % self.ptc.rangeSep)
+            s = s.replace('  ', ' ')
+
+        for cre, rflag in [(self.ptc.CRE_TIMERNG1, 1),
+                           (self.ptc.CRE_TIMERNG2, 2),
+                           (self.ptc.CRE_TIMERNG4, 7),
+                           (self.ptc.CRE_TIMERNG3, 3),
+                           (self.ptc.CRE_DATERNG1, 4),
+                           (self.ptc.CRE_DATERNG2, 5),
+                           (self.ptc.CRE_DATERNG3, 6)]:
+            m = cre.search(s)
+            if m is not None:
+                rangeFlag = rflag
+                break
+
+        debug and log.debug('evalRanges: rangeFlag = %s [%s]', rangeFlag, s)
+
+        if m is not None:
+            if (m.group() != s):
+                # capture remaining string
+                parseStr = m.group()
+                chunk1 = s[:m.start()]
+                chunk2 = s[m.end():]
+                s = '%s %s' % (chunk1, chunk2)
+
+                sourceTime, ctx = self.parse(s, sourceTime,
+                                             VERSION_CONTEXT_STYLE)
+
+                if not ctx.hasDateOrTime:
+                    sourceTime = None
+            else:
+                parseStr = s
+
+        if rangeFlag in (1, 2):
+            m = re.search(self.ptc.rangeSep, parseStr)
+            startStr = parseStr[:m.start()]
+            endStr = parseStr[m.start() + 1:]
+            retFlag = 2
+
+        elif rangeFlag in (3, 7):
+            m = re.search(self.ptc.rangeSep, parseStr)
+            # capturing the meridian from the end time
+            if self.ptc.usesMeridian:
+                ampm = re.search(self.ptc.am[0], parseStr)
+
+                # appending the meridian to the start time
+                if ampm is not None:
+                    startStr = parseStr[:m.start()] + self.ptc.meridian[0]
+                else:
+                    startStr = parseStr[:m.start()] + self.ptc.meridian[1]
+            else:
+                startStr = parseStr[:m.start()]
+
+            endStr = parseStr[m.start() + 1:]
+            retFlag = 2
+
+        elif rangeFlag == 4:
+            m = re.search(self.ptc.rangeSep, parseStr)
+            startStr = parseStr[:m.start()]
+            endStr = parseStr[m.start() + 1:]
+            retFlag = 1
+
+        elif rangeFlag == 5:
+            m = re.search(self.ptc.rangeSep, parseStr)
+            endStr = parseStr[m.start() + 1:]
+
+            # capturing the year from the end date
+            date = self.ptc.CRE_DATE3.search(endStr)
+            endYear = date.group('year')
+
+            # appending the year to the start date if the start date
+            # does not have year information and the end date does.
+            # eg : "Aug 21 - Sep 4, 2007"
+            if endYear is not None:
+                startStr = (parseStr[:m.start()]).strip()
+                date = self.ptc.CRE_DATE3.search(startStr)
+                startYear = date.group('year')
+
+                if startYear is None:
+                    startStr = startStr + ', ' + endYear
+            else:
+                startStr = parseStr[:m.start()]
+
+            retFlag = 1
+
+        elif rangeFlag == 6:
+            m = re.search(self.ptc.rangeSep, parseStr)
+
+            startStr = parseStr[:m.start()]
+
+            # capturing the month from the start date
+            mth = self.ptc.CRE_DATE3.search(startStr)
+            mth = mth.group('mthname')
+
+            # appending the month name to the end date
+            endStr = mth + parseStr[(m.start() + 1):]
+
+            retFlag = 1
+
+        else:
+            # if range is not found
+            startDT = endDT = time.localtime()
+
+        if retFlag:
+            startDT, sctx = self.parse(startStr, sourceTime,
+                                       VERSION_CONTEXT_STYLE)
+            endDT, ectx = self.parse(endStr, sourceTime,
+                                     VERSION_CONTEXT_STYLE)
+
+            if not sctx.hasDateOrTime or not ectx.hasDateOrTime:
+                retFlag = 0
+
+        return startDT, endDT, retFlag
+
+    def _CalculateDOWDelta(self, wd, wkdy, offset, style, currentDayStyle):
+        """
+        Based on the C{style} and C{currentDayStyle} determine what
+        day-of-week value is to be returned.
+
+        @type  wd:              integer
+        @param wd:              day-of-week value for the current day
+        @type  wkdy:            integer
+        @param wkdy:            day-of-week value for the parsed day
+        @type  offset:          integer
+        @param offset:          offset direction for any modifiers (-1, 0, 1)
+        @type  style:           integer
+        @param style:           normally the value
+                                set in C{Constants.DOWParseStyle}
+        @type  currentDayStyle: integer
+        @param currentDayStyle: normally the value
+                                set in C{Constants.CurrentDOWParseStyle}
+
+        @rtype:  integer
+        @return: calculated day-of-week
+        """
+        diffBase = wkdy - wd
+        origOffset = offset
+
+        if offset == 2:
+            # no modifier is present.
+            # i.e. string to be parsed is just DOW
+            if wkdy * style > wd * style or \
+                    currentDayStyle and wkdy == wd:
+                # wkdy located in current week
+                offset = 0
+            elif style in (-1, 1):
+                # wkdy located in last (-1) or next (1) week
+                offset = style
+            else:
+                # invalid style, or should raise error?
+                offset = 0
+
+        # offset = -1 means last week
+        # offset = 0 means current week
+        # offset = 1 means next week
+        diff = diffBase + 7 * offset
+        if style == 1 and diff < -7:
+            diff += 7
+        elif style == -1 and diff > 7:
+            diff -= 7
+
+        debug and log.debug("wd %s, wkdy %s, offset %d, "
+                            "style %d, currentDayStyle %d",
+                            wd, wkdy, origOffset, style, currentDayStyle)
+
+        return diff
+
+    def _quantityToReal(self, quantity):
+        """
+        Convert a quantity, either spelled-out or numeric, to a float
+
+        @type    quantity: string
+        @param   quantity: quantity to parse to float
+        @rtype:  int
+        @return: the quantity as an float, defaulting to 0.0
+        """
+        if not quantity:
+            return 1.0
+
+        try:
+            return float(quantity.replace(',', '.'))
+        except ValueError:
+            pass
+
+        try:
+            return float(self.ptc.numbers[quantity])
+        except KeyError:
+            pass
+
+        return 0.0
+
+    def _evalModifier(self, modifier, chunk1, chunk2, sourceTime):
+        """
+        Evaluate the C{modifier} string and following text (passed in
+        as C{chunk1} and C{chunk2}) and if they match any known modifiers
+        calculate the delta and apply it to C{sourceTime}.
+
+        @type  modifier:   string
+        @param modifier:   modifier text to apply to sourceTime
+        @type  chunk1:     string
+        @param chunk1:     text chunk that preceded modifier (if any)
+        @type  chunk2:     string
+        @param chunk2:     text chunk that followed modifier (if any)
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of: remaining text and the modified sourceTime
+        """
+        ctx = self.currentContext
+        offset = self.ptc.Modifiers[modifier]
+
+        if sourceTime is not None:
+            (yr, mth, dy, hr, mn, sec, wd, yd, isdst) = sourceTime
+        else:
+            (yr, mth, dy, hr, mn, sec, wd, yd, isdst) = time.localtime()
+
+        if self.ptc.StartTimeFromSourceTime:
+            startHour = hr
+            startMinute = mn
+            startSecond = sec
+        else:
+            startHour = 9
+            startMinute = 0
+            startSecond = 0
+
+        # capture the units after the modifier and the remaining
+        # string after the unit
+        m = self.ptc.CRE_REMAINING.search(chunk2)
+        if m is not None:
+            index = m.start() + 1
+            unit = chunk2[:m.start()]
+            chunk2 = chunk2[index:]
+        else:
+            unit = chunk2
+            chunk2 = ''
+
+        debug and log.debug("modifier [%s] chunk1 [%s] "
+                            "chunk2 [%s] unit [%s]",
+                            modifier, chunk1, chunk2, unit)
+
+        if unit in self.ptc.units['months']:
+            currentDaysInMonth = self.ptc.daysInMonth(mth, yr)
+            if offset == 0:
+                dy = currentDaysInMonth
+                sourceTime = (yr, mth, dy, startHour, startMinute,
+                              startSecond, wd, yd, isdst)
+            elif offset == 2:
+                # if day is the last day of the month, calculate the last day
+                # of the next month
+                if dy == currentDaysInMonth:
+                    dy = self.ptc.daysInMonth(mth + 1, yr)
+
+                start = datetime.datetime(yr, mth, dy, startHour,
+                                          startMinute, startSecond)
+                target = self.inc(start, month=1)
+                sourceTime = target.timetuple()
+            else:
+                start = datetime.datetime(yr, mth, 1, startHour,
+                                          startMinute, startSecond)
+                target = self.inc(start, month=offset)
+                sourceTime = target.timetuple()
+            ctx.updateAccuracy(ctx.ACU_MONTH)
+
+        elif unit in self.ptc.units['weeks']:
+            if offset == 0:
+                start = datetime.datetime(yr, mth, dy, 17, 0, 0)
+                target = start + datetime.timedelta(days=(4 - wd))
+                sourceTime = target.timetuple()
+            elif offset == 2:
+                start = datetime.datetime(yr, mth, dy, startHour,
+                                          startMinute, startSecond)
+                target = start + datetime.timedelta(days=7)
+                sourceTime = target.timetuple()
+            else:
+                start = datetime.datetime(yr, mth, dy, startHour,
+                                          startMinute, startSecond)
+                target = start + offset * datetime.timedelta(weeks=1)
+                sourceTime = target.timetuple()
+            ctx.updateAccuracy(ctx.ACU_WEEK)
+
+        elif unit in self.ptc.units['days']:
+            if offset == 0:
+                sourceTime = (yr, mth, dy, 17, 0, 0, wd, yd, isdst)
+                ctx.updateAccuracy(ctx.ACU_HALFDAY)
+            elif offset == 2:
+                start = datetime.datetime(yr, mth, dy, hr, mn, sec)
+                target = start + datetime.timedelta(days=1)
+                sourceTime = target.timetuple()
+            else:
+                start = datetime.datetime(yr, mth, dy, startHour,
+                                          startMinute, startSecond)
+                target = start + datetime.timedelta(days=offset)
+                sourceTime = target.timetuple()
+            ctx.updateAccuracy(ctx.ACU_DAY)
+
+        elif unit in self.ptc.units['hours']:
+            if offset == 0:
+                sourceTime = (yr, mth, dy, hr, 0, 0, wd, yd, isdst)
+            else:
+                start = datetime.datetime(yr, mth, dy, hr, 0, 0)
+                target = start + datetime.timedelta(hours=offset)
+                sourceTime = target.timetuple()
+            ctx.updateAccuracy(ctx.ACU_HOUR)
+
+        elif unit in self.ptc.units['years']:
+            if offset == 0:
+                sourceTime = (yr, 12, 31, hr, mn, sec, wd, yd, isdst)
+            elif offset == 2:
+                sourceTime = (yr + 1, mth, dy, hr, mn, sec, wd, yd, isdst)
+            else:
+                sourceTime = (yr + offset, 1, 1, startHour, startMinute,
+                              startSecond, wd, yd, isdst)
+            ctx.updateAccuracy(ctx.ACU_YEAR)
+
+        elif modifier == 'eom':
+            dy = self.ptc.daysInMonth(mth, yr)
+            sourceTime = (yr, mth, dy, startHour, startMinute,
+                          startSecond, wd, yd, isdst)
+            ctx.updateAccuracy(ctx.ACU_DAY)
+
+        elif modifier == 'eoy':
+            mth = 12
+            dy = self.ptc.daysInMonth(mth, yr)
+            sourceTime = (yr, mth, dy, startHour, startMinute,
+                          startSecond, wd, yd, isdst)
+            ctx.updateAccuracy(ctx.ACU_MONTH)
+
+        elif self.ptc.CRE_WEEKDAY.match(unit):
+            m = self.ptc.CRE_WEEKDAY.match(unit)
+            debug and log.debug('CRE_WEEKDAY matched')
+            wkdy = m.group()
+
+            if modifier == 'eod':
+                ctx.updateAccuracy(ctx.ACU_HOUR)
+                # Calculate the upcoming weekday
+                sourceTime, subctx = self.parse(wkdy, sourceTime,
+                                                VERSION_CONTEXT_STYLE)
+                sTime = self.ptc.getSource(modifier, sourceTime)
+                if sTime is not None:
+                    sourceTime = sTime
+                    ctx.updateAccuracy(ctx.ACU_HALFDAY)
+            else:
+                # unless one of these modifiers is being applied to the
+                # day-of-week, we want to start with target as the day
+                # in the current week.
+                dowOffset = offset
+                if modifier not in ['next', 'last', 'prior', 'previous']:
+                    dowOffset = 0
+
+                wkdy = self.ptc.WeekdayOffsets[wkdy]
+                diff = self._CalculateDOWDelta(
+                    wd, wkdy, dowOffset, self.ptc.DOWParseStyle,
+                    self.ptc.CurrentDOWParseStyle)
+                start = datetime.datetime(yr, mth, dy, startHour,
+                                          startMinute, startSecond)
+                target = start + datetime.timedelta(days=diff)
+
+                if chunk1 != '':
+                    # consider "one day before thursday": we need to parse chunk1 ("one day")
+                    # and apply according to the offset ("before"), rather than allowing the
+                    # remaining parse step to apply "one day" without the offset direction.
+                    t, subctx = self.parse(chunk1, sourceTime, VERSION_CONTEXT_STYLE)
+                    if subctx.hasDateOrTime:
+                        delta = time.mktime(t) - time.mktime(sourceTime)
+                        target = start + datetime.timedelta(days=diff) + datetime.timedelta(seconds=delta * offset)
+                        chunk1 = ''
+
+                sourceTime = target.timetuple()
+            ctx.updateAccuracy(ctx.ACU_DAY)
+
+        elif self.ptc.CRE_TIME.match(unit):
+            m = self.ptc.CRE_TIME.match(unit)
+            debug and log.debug('CRE_TIME matched')
+            (yr, mth, dy, hr, mn, sec, wd, yd, isdst), subctx = \
+                self.parse(unit, None, VERSION_CONTEXT_STYLE)
+
+            start = datetime.datetime(yr, mth, dy, hr, mn, sec)
+            target = start + datetime.timedelta(days=offset)
+            sourceTime = target.timetuple()
+
+        else:
+            # check if the remaining text is parsable and if so,
+            # use it as the base time for the modifier source time
+
+            debug and log.debug('check for modifications '
+                                'to source time [%s] [%s]',
+                                chunk1, unit)
+
+            unit = unit.strip()
+            if unit:
+                s = '%s %s' % (unit, chunk2)
+                t, subctx = self.parse(s, sourceTime, VERSION_CONTEXT_STYLE)
+
+                if subctx.hasDate:  # working with dates
+                    u = unit.lower()
+                    if u in self.ptc.Months or \
+                            u in self.ptc.shortMonths:
+                        yr, mth, dy, hr, mn, sec, wd, yd, isdst = t
+                        start = datetime.datetime(
+                            yr, mth, dy, hr, mn, sec)
+                        t = self.inc(start, year=offset).timetuple()
+                    elif u in self.ptc.Weekdays:
+                        t = t + datetime.timedelta(weeks=offset)
+
+                if subctx.hasDateOrTime:
+                    sourceTime = t
+                    chunk2 = ''
+
+            chunk1 = chunk1.strip()
+
+            # if the word after next is a number, the string is more than
+            # likely to be "next 4 hrs" which we will have to combine the
+            # units with the rest of the string
+            if chunk1:
+                try:
+                    m = list(self.ptc.CRE_NUMBER.finditer(chunk1))[-1]
+                except IndexError:
+                    pass
+                else:
+                    qty = None
+                    debug and log.debug('CRE_NUMBER matched')
+                    qty = self._quantityToReal(m.group()) * offset
+                    chunk1 = '%s%s%s' % (chunk1[:m.start()],
+                                         qty, chunk1[m.end():])
+                t, subctx = self.parse(chunk1, sourceTime,
+                                       VERSION_CONTEXT_STYLE)
+
+                chunk1 = ''
+
+                if subctx.hasDateOrTime:
+                    sourceTime = t
+
+            debug and log.debug('looking for modifier %s', modifier)
+            sTime = self.ptc.getSource(modifier, sourceTime)
+            if sTime is not None:
+                debug and log.debug('modifier found in sources')
+                sourceTime = sTime
+                ctx.updateAccuracy(ctx.ACU_HALFDAY)
+
+        debug and log.debug('returning chunk = "%s %s" and sourceTime = %s',
+                            chunk1, chunk2, sourceTime)
+
+        return '%s %s' % (chunk1, chunk2), sourceTime
+
+    def _evalDT(self, datetimeString, sourceTime):
+        """
+        Calculate the datetime from known format like RFC822 or W3CDTF
+
+        Examples handled::
+            RFC822, W3CDTF formatted dates
+            HH:MM[:SS][ am/pm]
+            MM/DD/YYYY
+            DD MMMM YYYY
+
+        @type  datetimeString: string
+        @param datetimeString: text to try and parse as more "traditional"
+                               date/time text
+        @type  sourceTime:     struct_time
+        @param sourceTime:     C{struct_time} value to use as the base
+
+        @rtype:  datetime
+        @return: calculated C{struct_time} value or current C{struct_time}
+                 if not parsed
+        """
+        ctx = self.currentContext
+        s = datetimeString.strip()
+
+        # Given string date is a RFC822 date
+        if sourceTime is None:
+            sourceTime = _parse_date_rfc822(s)
+            debug and log.debug(
+                'attempt to parse as rfc822 - %s', str(sourceTime))
+
+            if sourceTime is not None:
+                (yr, mth, dy, hr, mn, sec, wd, yd, isdst, _) = sourceTime
+                ctx.updateAccuracy(ctx.ACU_YEAR, ctx.ACU_MONTH, ctx.ACU_DAY)
+
+                if hr != 0 and mn != 0 and sec != 0:
+                    ctx.updateAccuracy(ctx.ACU_HOUR, ctx.ACU_MIN, ctx.ACU_SEC)
+
+                sourceTime = (yr, mth, dy, hr, mn, sec, wd, yd, isdst)
+
+        # Given string date is a W3CDTF date
+        if sourceTime is None:
+            sourceTime = _parse_date_w3dtf(s)
+
+            if sourceTime is not None:
+                ctx.updateAccuracy(ctx.ACU_YEAR, ctx.ACU_MONTH, ctx.ACU_DAY,
+                                   ctx.ACU_HOUR, ctx.ACU_MIN, ctx.ACU_SEC)
+
+        if sourceTime is None:
+            sourceTime = time.localtime()
+
+        return sourceTime
+
+    def _evalUnits(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseUnits()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is a time string with units like "5 hrs 30 min"
+        modifier = ''  # TODO
+
+        m = self.ptc.CRE_UNITS.search(s)
+        if m is not None:
+            units = m.group('units')
+            quantity = s[:m.start('units')]
+
+        sourceTime = self._buildTime(sourceTime, quantity, modifier, units)
+        return sourceTime
+
+    def _evalQUnits(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseQUnits()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is a time string with single char units like "5 h 30 m"
+        modifier = ''  # TODO
+
+        m = self.ptc.CRE_QUNITS.search(s)
+        if m is not None:
+            units = m.group('qunits')
+            quantity = s[:m.start('qunits')]
+
+        sourceTime = self._buildTime(sourceTime, quantity, modifier, units)
+        return sourceTime
+
+    def _evalDateStr(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseDateStr()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is in the format  "May 23rd, 2005"
+        debug and log.debug('checking for MMM DD YYYY')
+        return self.parseDateText(s, sourceTime)
+
+    def _evalDateStd(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseDateStd()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is in the format 07/21/2006
+        return self.parseDate(s, sourceTime)
+
+    def _evalDayStr(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseDaystr()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is a natural language date string like today, tomorrow..
+        (yr, mth, dy, hr, mn, sec, wd, yd, isdst) = sourceTime
+
+        try:
+            offset = self.ptc.dayOffsets[s]
+        except KeyError:
+            offset = 0
+
+        if self.ptc.StartTimeFromSourceTime:
+            startHour = hr
+            startMinute = mn
+            startSecond = sec
+        else:
+            startHour = 9
+            startMinute = 0
+            startSecond = 0
+
+        self.currentContext.updateAccuracy(pdtContext.ACU_DAY)
+        start = datetime.datetime(yr, mth, dy, startHour,
+                                  startMinute, startSecond)
+        target = start + datetime.timedelta(days=offset)
+        return target.timetuple()
+
+    def _evalWeekday(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseWeekday()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is a weekday
+        yr, mth, dy, hr, mn, sec, wd, yd, isdst = sourceTime
+
+        start = datetime.datetime(yr, mth, dy, hr, mn, sec)
+        wkdy = self.ptc.WeekdayOffsets[s]
+
+        if wkdy > wd:
+            qty = self._CalculateDOWDelta(wd, wkdy, 2,
+                                          self.ptc.DOWParseStyle,
+                                          self.ptc.CurrentDOWParseStyle)
+        else:
+            qty = self._CalculateDOWDelta(wd, wkdy, 2,
+                                          self.ptc.DOWParseStyle,
+                                          self.ptc.CurrentDOWParseStyle)
+
+        self.currentContext.updateAccuracy(pdtContext.ACU_DAY)
+        target = start + datetime.timedelta(days=qty)
+        return target.timetuple()
+
+    def _evalTimeStr(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseTimeStr()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        if s in self.ptc.re_values['now']:
+            self.currentContext.updateAccuracy(pdtContext.ACU_NOW)
+        else:
+            # Given string is a natural language time string like
+            # lunch, midnight, etc
+            sTime = self.ptc.getSource(s, sourceTime)
+            if sTime:
+                sourceTime = sTime
+            self.currentContext.updateAccuracy(pdtContext.ACU_HALFDAY)
+
+        return sourceTime
+
+    def _evalMeridian(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseMeridian()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is in the format HH:MM(:SS)(am/pm)
+        yr, mth, dy, hr, mn, sec, wd, yd, isdst = sourceTime
+
+        m = self.ptc.CRE_TIMEHMS2.search(s)
+        if m is not None:
+            dt = s[:m.start('meridian')].strip()
+            if len(dt) <= 2:
+                hr = int(dt)
+                mn = 0
+                sec = 0
+            else:
+                hr, mn, sec = _extract_time(m)
+
+            if hr == 24:
+                hr = 0
+
+            meridian = m.group('meridian').lower()
+
+            # if 'am' found and hour is 12 - force hour to 0 (midnight)
+            if (meridian in self.ptc.am) and hr == 12:
+                hr = 0
+
+            # if 'pm' found and hour < 12, add 12 to shift to evening
+            if (meridian in self.ptc.pm) and hr < 12:
+                hr += 12
+
+        # time validation
+        if hr < 24 and mn < 60 and sec < 60:
+            sourceTime = (yr, mth, dy, hr, mn, sec, wd, yd, isdst)
+            _pop_time_accuracy(m, self.currentContext)
+
+        return sourceTime
+
+    def _evalTimeStd(self, datetimeString, sourceTime):
+        """
+        Evaluate text passed by L{_partialParseTimeStd()}
+        """
+        s = datetimeString.strip()
+        sourceTime = self._evalDT(datetimeString, sourceTime)
+
+        # Given string is in the format HH:MM(:SS)
+        yr, mth, dy, hr, mn, sec, wd, yd, isdst = sourceTime
+
+        m = self.ptc.CRE_TIMEHMS.search(s)
+        if m is not None:
+            hr, mn, sec = _extract_time(m)
+        if hr == 24:
+            hr = 0
+
+        # time validation
+        if hr < 24 and mn < 60 and sec < 60:
+            sourceTime = (yr, mth, dy, hr, mn, sec, wd, yd, isdst)
+            _pop_time_accuracy(m, self.currentContext)
+
+        return sourceTime
+
+    def _UnitsTrapped(self, s, m, key):
+        # check if a day suffix got trapped by a unit match
+        # for example Dec 31st would match for 31s (aka 31 seconds)
+        # Dec 31st
+        #     ^ ^
+        #     | +-- m.start('units')
+        #     |     and also m2.start('suffix')
+        #     +---- m.start('qty')
+        #           and also m2.start('day')
+        m2 = self.ptc.CRE_DAY2.search(s)
+        if m2 is not None:
+            t = '%s%s' % (m2.group('day'), m.group(key))
+            if m.start(key) == m2.start('suffix') and \
+                    m.start('qty') == m2.start('day') and \
+                    m.group('qty') == t:
+                return True
+            else:
+                return False
+        else:
+            return False
+
+    def _partialParseModifier(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_MODIFIER, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Modifier like next/prev/from/after/prior..
+        m = self.ptc.CRE_MODIFIER.search(s)
+        if m is not None:
+            if m.group() != s:
+                # capture remaining string
+                parseStr = m.group()
+                chunk1 = s[:m.start()].strip()
+                chunk2 = s[m.end():].strip()
+            else:
+                parseStr = s
+
+        if parseStr:
+            debug and log.debug('found (modifier) [%s][%s][%s]',
+                                parseStr, chunk1, chunk2)
+            s, sourceTime = self._evalModifier(parseStr, chunk1,
+                                               chunk2, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseUnits(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_UNITS, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Quantity + Units
+        m = self.ptc.CRE_UNITS.search(s)
+        if m is not None:
+            debug and log.debug('CRE_UNITS matched')
+            if self._UnitsTrapped(s, m, 'units'):
+                debug and log.debug('day suffix trapped by unit match')
+            else:
+                if (m.group('qty') != s):
+                    # capture remaining string
+                    parseStr = m.group('qty')
+                    chunk1 = s[:m.start('qty')].strip()
+                    chunk2 = s[m.end('qty'):].strip()
+
+                    if chunk1[-1:] == '-':
+                        parseStr = '-%s' % parseStr
+                        chunk1 = chunk1[:-1]
+
+                    s = '%s %s' % (chunk1, chunk2)
+                else:
+                    parseStr = s
+                    s = ''
+
+        if parseStr:
+            debug and log.debug('found (units) [%s][%s][%s]',
+                                parseStr, chunk1, chunk2)
+            sourceTime = self._evalUnits(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseQUnits(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_QUNITS, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Quantity + Units
+        m = self.ptc.CRE_QUNITS.search(s)
+        if m is not None:
+            debug and log.debug('CRE_QUNITS matched')
+            if self._UnitsTrapped(s, m, 'qunits'):
+                debug and log.debug(
+                    'day suffix trapped by qunit match')
+            else:
+                if (m.group('qty') != s):
+                    # capture remaining string
+                    parseStr = m.group('qty')
+                    chunk1 = s[:m.start('qty')].strip()
+                    chunk2 = s[m.end('qty'):].strip()
+
+                    if chunk1[-1:] == '-':
+                        parseStr = '-%s' % parseStr
+                        chunk1 = chunk1[:-1]
+
+                    s = '%s %s' % (chunk1, chunk2)
+                else:
+                    parseStr = s
+                    s = ''
+
+        if parseStr:
+            debug and log.debug('found (qunits) [%s][%s][%s]',
+                                parseStr, chunk1, chunk2)
+            sourceTime = self._evalQUnits(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseDateStr(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_DATE3, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        m = self.ptc.CRE_DATE3.search(s)
+        # NO LONGER NEEDED, THE REGEXP HANDLED MTHNAME NOW
+        # for match in self.ptc.CRE_DATE3.finditer(s):
+        # to prevent "HH:MM(:SS) time strings" expressions from
+        # triggering this regex, we checks if the month field
+        # exists in the searched expression, if it doesn't exist,
+        # the date field is not valid
+        #     if match.group('mthname'):
+        #         m = self.ptc.CRE_DATE3.search(s, match.start())
+        #         valid_date = True
+        #         break
+
+        # String date format
+        if m is not None:
+
+            if (m.group('date') != s):
+                # capture remaining string
+                mStart = m.start('date')
+                mEnd = m.end('date')
+
+                # we need to check that anything following the parsed
+                # date is a time expression because it is often picked
+                # up as a valid year if the hour is 2 digits
+                fTime = False
+                mm = self.ptc.CRE_TIMEHMS2.search(s)
+                # "February 24th 1PM" doesn't get caught
+                # "February 24th 12PM" does
+                mYear = m.group('year')
+                if mm is not None and mYear is not None:
+                    fTime = True
+                else:
+                    # "February 24th 12:00"
+                    mm = self.ptc.CRE_TIMEHMS.search(s)
+                    if mm is not None and mYear is None:
+                        fTime = True
+                if fTime:
+                    hoursStart = mm.start('hours')
+
+                    if hoursStart < m.end('year'):
+                        mEnd = hoursStart
+
+                parseStr = s[mStart:mEnd]
+                chunk1 = s[:mStart]
+                chunk2 = s[mEnd:]
+
+                s = '%s %s' % (chunk1, chunk2)
+            else:
+                parseStr = s
+                s = ''
+
+        if parseStr:
+            debug and log.debug(
+                'found (date3) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalDateStr(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseDateStd(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_DATE, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Standard date format
+        m = self.ptc.CRE_DATE.search(s)
+        if m is not None:
+
+            if (m.group('date') != s):
+                # capture remaining string
+                parseStr = m.group('date')
+                chunk1 = s[:m.start('date')]
+                chunk2 = s[m.end('date'):]
+                s = '%s %s' % (chunk1, chunk2)
+            else:
+                parseStr = s
+                s = ''
+
+        if parseStr:
+            debug and log.debug(
+                'found (date) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalDateStd(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseDayStr(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_DAY, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Natural language day strings
+        m = self.ptc.CRE_DAY.search(s)
+        if m is not None:
+
+            if (m.group() != s):
+                # capture remaining string
+                parseStr = m.group()
+                chunk1 = s[:m.start()]
+                chunk2 = s[m.end():]
+                s = '%s %s' % (chunk1, chunk2)
+            else:
+                parseStr = s
+                s = ''
+
+        if parseStr:
+            debug and log.debug(
+                'found (day) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalDayStr(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseWeekday(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_WEEKDAY, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Weekday
+        m = self.ptc.CRE_WEEKDAY.search(s)
+        if m is not None:
+            gv = m.group()
+            if s not in self.ptc.dayOffsets:
+
+                if (gv != s):
+                    # capture remaining string
+                    parseStr = gv
+                    chunk1 = s[:m.start()]
+                    chunk2 = s[m.end():]
+                    s = '%s %s' % (chunk1, chunk2)
+                else:
+                    parseStr = s
+                    s = ''
+
+        if parseStr:
+            debug and log.debug(
+                'found (weekday) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalWeekday(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseTimeStr(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_TIME, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # Natural language time strings
+        m = self.ptc.CRE_TIME.search(s)
+        if m is not None or s in self.ptc.re_values['now']:
+
+            if (m and m.group() != s):
+                # capture remaining string
+                parseStr = m.group()
+                chunk1 = s[:m.start()]
+                chunk2 = s[m.end():]
+                s = '%s %s' % (chunk1, chunk2)
+            else:
+                parseStr = s
+                s = ''
+
+        if parseStr:
+            debug and log.debug(
+                'found (time) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalTimeStr(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseMeridian(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_TIMEHMS2, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # HH:MM(:SS) am/pm time strings
+        m = self.ptc.CRE_TIMEHMS2.search(s)
+        if m is not None:
+
+            if m.group('minutes') is not None:
+                if m.group('seconds') is not None:
+                    parseStr = '%s:%s:%s' % (m.group('hours'),
+                                             m.group('minutes'),
+                                             m.group('seconds'))
+                else:
+                    parseStr = '%s:%s' % (m.group('hours'),
+                                          m.group('minutes'))
+            else:
+                parseStr = m.group('hours')
+            parseStr += ' ' + m.group('meridian')
+
+            chunk1 = s[:m.start()]
+            chunk2 = s[m.end():]
+
+            s = '%s %s' % (chunk1, chunk2)
+
+        if parseStr:
+            debug and log.debug('found (meridian) [%s][%s][%s]',
+                                parseStr, chunk1, chunk2)
+            sourceTime = self._evalMeridian(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def _partialParseTimeStd(self, s, sourceTime):
+        """
+        test if giving C{s} matched CRE_TIMEHMS, used by L{parse()}
+
+        @type  s:          string
+        @param s:          date/time text to evaluate
+        @type  sourceTime: struct_time
+        @param sourceTime: C{struct_time} value to use as the base
+
+        @rtype:  tuple
+        @return: tuple of remained date/time text, datetime object and
+                 an boolean value to describ if matched or not
+
+        """
+        parseStr = None
+        chunk1 = chunk2 = ''
+
+        # HH:MM(:SS) time strings
+        m = self.ptc.CRE_TIMEHMS.search(s)
+        if m is not None:
+
+            if m.group('seconds') is not None:
+                parseStr = '%s:%s:%s' % (m.group('hours'),
+                                         m.group('minutes'),
+                                         m.group('seconds'))
+                chunk1 = s[:m.start('hours')]
+                chunk2 = s[m.end('seconds'):]
+            else:
+                parseStr = '%s:%s' % (m.group('hours'),
+                                      m.group('minutes'))
+                chunk1 = s[:m.start('hours')]
+                chunk2 = s[m.end('minutes'):]
+
+            s = '%s %s' % (chunk1, chunk2)
+
+        if parseStr:
+            debug and log.debug(
+                'found (hms) [%s][%s][%s]', parseStr, chunk1, chunk2)
+            sourceTime = self._evalTimeStd(parseStr, sourceTime)
+
+        return s, sourceTime, bool(parseStr)
+
+    def parseDT(self, datetimeString, sourceTime=None,
+                tzinfo=None, version=None):
+        """
+        C{datetimeString} is as C{.parse}, C{sourceTime} has the same semantic
+        meaning as C{.parse}, but now also accepts datetime objects.  C{tzinfo}
+        accepts a tzinfo object.  It is advisable to use pytz.
+
+
+        @type  datetimeString: string
+        @param datetimeString: date/time text to evaluate
+        @type  sourceTime:     struct_time, datetime, date, time
+        @param sourceTime:     time value to use as the base
+        @type  tzinfo:         tzinfo
+        @param tzinfo:         Timezone to apply to generated datetime objs.
+        @type  version:        integer
+        @param version:        style version, default will use L{Calendar}
+                               parameter version value
+
+        @rtype:  tuple
+        @return: tuple of: modified C{sourceTime} and the result flag/context
+
+        see .parse for return code details.
+        """
+        # if sourceTime has a timetuple method, use thet, else, just pass the
+        # entire thing to parse and prey the user knows what the hell they are
+        # doing.
+        sourceTime = getattr(sourceTime, 'timetuple', (lambda: sourceTime))()
+        # You REALLY SHOULD be using pytz.  Using localize if available,
+        # hacking if not.  Note, None is a valid tzinfo object in the case of
+        # the ugly hack.
+        localize = getattr(
+            tzinfo,
+            'localize',
+            (lambda dt: dt.replace(tzinfo=tzinfo)),  # ugly hack is ugly :(
+        )
+
+        # Punt
+        time_struct, ret_code = self.parse(
+            datetimeString,
+            sourceTime=sourceTime,
+            version=version)
+
+        # Comments from GHI indicate that it is desired to have the same return
+        # signature on this method as that one it punts to, with the exception
+        # of using datetime objects instead of time_structs.
+        dt = localize(datetime.datetime(*time_struct[:6]))
+        return dt, ret_code
+
+    def parse(self, datetimeString, sourceTime=None, version=None):
+        """
+        Splits the given C{datetimeString} into tokens, finds the regex
+        patterns that match and then calculates a C{struct_time} value from
+        the chunks.
+
+        If C{sourceTime} is given then the C{struct_time} value will be
+        calculated from that value, otherwise from the current date/time.
+
+        If the C{datetimeString} is parsed and date/time value found, then::
+
+            If C{version} equals to L{VERSION_FLAG_STYLE}, the second item of
+            the returned tuple will be a flag to let you know what kind of
+            C{struct_time} value is being returned::
+
+                0 = not parsed at all
+                1 = parsed as a C{date}
+                2 = parsed as a C{time}
+                3 = parsed as a C{datetime}
+
+            If C{version} equals to L{VERSION_CONTEXT_STYLE}, the second value
+            will be an instance of L{pdtContext}
+
+        @type  datetimeString: string
+        @param datetimeString: date/time text to evaluate
+        @type  sourceTime:     struct_time
+        @param sourceTime:     C{struct_time} value to use as the base
+        @type  version:        integer
+        @param version:        style version, default will use L{Calendar}
+                               parameter version value
+
+        @rtype:  tuple
+        @return: tuple of: modified C{sourceTime} and the result flag/context
+        """
+        debug and log.debug('parse()')
+
+        datetimeString = re.sub(r'(\w)\.(\s)', r'\1\2', datetimeString)
+        datetimeString = re.sub(r'(\w)[\'"](\s|$)', r'\1 \2', datetimeString)
+        datetimeString = re.sub(r'(\s|^)[\'"](\w)', r'\1 \2', datetimeString)
+
+        if sourceTime:
+            if isinstance(sourceTime, datetime.datetime):
+                debug and log.debug('coercing datetime to timetuple')
+                sourceTime = sourceTime.timetuple()
+            else:
+                if not isinstance(sourceTime, time.struct_time) and \
+                        not isinstance(sourceTime, tuple):
+                    raise ValueError('sourceTime is not a struct_time')
+        else:
+            sourceTime = time.localtime()
+
+        with self.context() as ctx:
+            s = datetimeString.lower().strip()
+            debug and log.debug('remainedString (before parsing): [%s]', s)
+
+            while s:
+                for parseMeth in (self._partialParseModifier,
+                                  self._partialParseUnits,
+                                  self._partialParseQUnits,
+                                  self._partialParseDateStr,
+                                  self._partialParseDateStd,
+                                  self._partialParseDayStr,
+                                  self._partialParseWeekday,
+                                  self._partialParseTimeStr,
+                                  self._partialParseMeridian,
+                                  self._partialParseTimeStd):
+                    retS, retTime, matched = parseMeth(s, sourceTime)
+                    if matched:
+                        s, sourceTime = retS.strip(), retTime
+                        break
+                else:
+                    # nothing matched
+                    s = ''
+
+                debug and log.debug('hasDate: [%s], hasTime: [%s]',
+                                    ctx.hasDate, ctx.hasTime)
+                debug and log.debug('remainedString: [%s]', s)
+
+            # String is not parsed at all
+            if sourceTime is None:
+                debug and log.debug('not parsed [%s]', str(sourceTime))
+                sourceTime = time.localtime()
+
+        if not isinstance(sourceTime, time.struct_time):
+            sourceTime = time.struct_time(sourceTime)
+
+        version = self.version if version is None else version
+        if version == VERSION_CONTEXT_STYLE:
+            return sourceTime, ctx
+        else:
+            return sourceTime, ctx.dateTimeFlag
+
+    def inc(self, source, month=None, year=None):
+        """
+        Takes the given C{source} date, or current date if none is
+        passed, and increments it according to the values passed in
+        by month and/or year.
+
+        This routine is needed because Python's C{timedelta()} function
+        does not allow for month or year increments.
+
+        @type  source: struct_time
+        @param source: C{struct_time} value to increment
+        @type  month:  float or integer
+        @param month:  optional number of months to increment
+        @type  year:   float or integer
+        @param year:   optional number of years to increment
+
+        @rtype:  datetime
+        @return: C{source} incremented by the number of months and/or years
+        """
+        yr = source.year
+        mth = source.month
+        dy = source.day
+
+        try:
+            month = float(month)
+        except (TypeError, ValueError):
+            month = 0
+
+        try:
+            year = float(year)
+        except (TypeError, ValueError):
+            year = 0
+        finally:
+            month += year * 12
+            year = 0
+
+        subMi = 0.0
+        maxDay = 0
+        if month:
+            mi = int(month)
+            subMi = month - mi
+
+            y = int(mi / 12.0)
+            m = mi - y * 12
+
+            mth = mth + m
+            if mth < 1:  # cross start-of-year?
+                y -= 1  # yes - decrement year
+                mth += 12  # and fix month
+            elif mth > 12:  # cross end-of-year?
+                y += 1  # yes - increment year
+                mth -= 12  # and fix month
+
+            yr += y
+
+            # if the day ends up past the last day of
+            # the new month, set it to the last day
+            maxDay = self.ptc.daysInMonth(mth, yr)
+            if dy > maxDay:
+                dy = maxDay
+
+        if yr > datetime.MAXYEAR or yr < datetime.MINYEAR:
+            raise OverflowError('year is out of range')
+
+        d = source.replace(year=yr, month=mth, day=dy)
+        if subMi:
+            d += datetime.timedelta(days=subMi * maxDay)
+        return source + (d - source)
+
+    def nlp(self, inputString, sourceTime=None, version=None):
+        """Utilizes parse() after making judgements about what datetime
+        information belongs together.
+
+        It makes logical groupings based on proximity and returns a parsed
+        datetime for each matched grouping of datetime text, along with
+        location info within the given inputString.
+
+        @type  inputString: string
+        @param inputString: natural language text to evaluate
+        @type  sourceTime:  struct_time
+        @param sourceTime:  C{struct_time} value to use as the base
+        @type  version:     integer
+        @param version:     style version, default will use L{Calendar}
+                            parameter version value
+
+        @rtype:  tuple or None
+        @return: tuple of tuples in the format (parsed_datetime as
+                 datetime.datetime, flags as int, start_pos as int,
+                 end_pos as int, matched_text as string) or None if there
+                 were no matches
+        """
+
+        orig_inputstring = inputString
+
+        # replace periods at the end of sentences w/ spaces
+        # opposed to removing them altogether in order to
+        # retain relative positions (identified by alpha, period, space).
+        # this is required for some of the regex patterns to match
+        inputString = re.sub(r'(\w)(\.)(\s)', r'\1 \3', inputString).lower()
+        inputString = re.sub(r'(\w)(\'|")(\s|$)', r'\1 \3', inputString)
+        inputString = re.sub(r'(\s|^)(\'|")(\w)', r'\1 \3', inputString)
+
+        startpos = 0  # the start position in the inputString during the loop
+
+        # list of lists in format:
+        # [startpos, endpos, matchedstring, flags, type]
+        matches = []
+
+        while startpos < len(inputString):
+
+            # empty match
+            leftmost_match = [0, 0, None, 0, None]
+
+            # Modifier like next\prev..
+            m = self.ptc.CRE_MODIFIER.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start() + startpos:
+                    leftmost_match[0] = m.start() + startpos
+                    leftmost_match[1] = m.end() + startpos
+                    leftmost_match[2] = m.group()
+                    leftmost_match[3] = 0
+                    leftmost_match[4] = 'modifier'
+
+            # Quantity + Units
+            m = self.ptc.CRE_UNITS.search(inputString[startpos:])
+            if m is not None:
+                debug and log.debug('CRE_UNITS matched')
+                if self._UnitsTrapped(inputString[startpos:], m, 'units'):
+                    debug and log.debug('day suffix trapped by unit match')
+                else:
+
+                    if leftmost_match[1] == 0 or \
+                            leftmost_match[0] > m.start('qty') + startpos:
+                        leftmost_match[0] = m.start('qty') + startpos
+                        leftmost_match[1] = m.end('qty') + startpos
+                        leftmost_match[2] = m.group('qty')
+                        leftmost_match[3] = 3
+                        leftmost_match[4] = 'units'
+
+                        if m.start('qty') > 0 and \
+                                inputString[m.start('qty') - 1] == '-':
+                            leftmost_match[0] = leftmost_match[0] - 1
+                            leftmost_match[2] = '-' + leftmost_match[2]
+
+            # Quantity + Units
+            m = self.ptc.CRE_QUNITS.search(inputString[startpos:])
+            if m is not None:
+                debug and log.debug('CRE_QUNITS matched')
+                if self._UnitsTrapped(inputString[startpos:], m, 'qunits'):
+                    debug and log.debug('day suffix trapped by qunit match')
+                else:
+                    if leftmost_match[1] == 0 or \
+                            leftmost_match[0] > m.start('qty') + startpos:
+                        leftmost_match[0] = m.start('qty') + startpos
+                        leftmost_match[1] = m.end('qty') + startpos
+                        leftmost_match[2] = m.group('qty')
+                        leftmost_match[3] = 3
+                        leftmost_match[4] = 'qunits'
+
+                        if m.start('qty') > 0 and \
+                                inputString[m.start('qty') - 1] == '-':
+                            leftmost_match[0] = leftmost_match[0] - 1
+                            leftmost_match[2] = '-' + leftmost_match[2]
+
+            m = self.ptc.CRE_DATE3.search(inputString[startpos:])
+            # NO LONGER NEEDED, THE REGEXP HANDLED MTHNAME NOW
+            # for match in self.ptc.CRE_DATE3.finditer(inputString[startpos:]):
+            # to prevent "HH:MM(:SS) time strings" expressions from
+            # triggering this regex, we checks if the month field exists
+            # in the searched expression, if it doesn't exist, the date
+            # field is not valid
+            #     if match.group('mthname'):
+            #         m = self.ptc.CRE_DATE3.search(inputString[startpos:],
+            #                                       match.start())
+            #         break
+
+            # String date format
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start('date') + startpos:
+                    leftmost_match[0] = m.start('date') + startpos
+                    leftmost_match[1] = m.end('date') + startpos
+                    leftmost_match[2] = m.group('date')
+                    leftmost_match[3] = 1
+                    leftmost_match[4] = 'dateStr'
+
+            # Standard date format
+            m = self.ptc.CRE_DATE.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start('date') + startpos:
+                    leftmost_match[0] = m.start('date') + startpos
+                    leftmost_match[1] = m.end('date') + startpos
+                    leftmost_match[2] = m.group('date')
+                    leftmost_match[3] = 1
+                    leftmost_match[4] = 'dateStd'
+
+            # Natural language day strings
+            m = self.ptc.CRE_DAY.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start() + startpos:
+                    leftmost_match[0] = m.start() + startpos
+                    leftmost_match[1] = m.end() + startpos
+                    leftmost_match[2] = m.group()
+                    leftmost_match[3] = 1
+                    leftmost_match[4] = 'dayStr'
+
+            # Weekday
+            m = self.ptc.CRE_WEEKDAY.search(inputString[startpos:])
+            if m is not None:
+                if inputString[startpos:] not in self.ptc.dayOffsets:
+                    if leftmost_match[1] == 0 or \
+                            leftmost_match[0] > m.start() + startpos:
+                        leftmost_match[0] = m.start() + startpos
+                        leftmost_match[1] = m.end() + startpos
+                        leftmost_match[2] = m.group()
+                        leftmost_match[3] = 1
+                        leftmost_match[4] = 'weekdy'
+
+            # Natural language time strings
+            m = self.ptc.CRE_TIME.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start() + startpos:
+                    leftmost_match[0] = m.start() + startpos
+                    leftmost_match[1] = m.end() + startpos
+                    leftmost_match[2] = m.group()
+                    leftmost_match[3] = 2
+                    leftmost_match[4] = 'timeStr'
+
+            # HH:MM(:SS) am/pm time strings
+            m = self.ptc.CRE_TIMEHMS2.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start('hours') + startpos:
+                    leftmost_match[0] = m.start('hours') + startpos
+                    leftmost_match[1] = m.end('meridian') + startpos
+                    leftmost_match[2] = inputString[leftmost_match[0]:
+                                                    leftmost_match[1]]
+                    leftmost_match[3] = 2
+                    leftmost_match[4] = 'meridian'
+
+            # HH:MM(:SS) time strings
+            m = self.ptc.CRE_TIMEHMS.search(inputString[startpos:])
+            if m is not None:
+                if leftmost_match[1] == 0 or \
+                        leftmost_match[0] > m.start('hours') + startpos:
+                    leftmost_match[0] = m.start('hours') + startpos
+                    if m.group('seconds') is not None:
+                        leftmost_match[1] = m.end('seconds') + startpos
+                    else:
+                        leftmost_match[1] = m.end('minutes') + startpos
+                    leftmost_match[2] = inputString[leftmost_match[0]:
+                                                    leftmost_match[1]]
+                    leftmost_match[3] = 2
+                    leftmost_match[4] = 'timeStd'
+
+            # Units only; must be preceded by a modifier
+            if len(matches) > 0 and matches[-1][3] == 0:
+                m = self.ptc.CRE_UNITS_ONLY.search(inputString[startpos:])
+                # Ensure that any match is immediately proceded by the
+                # modifier. "Next is the word 'month'" should not parse as a
+                # date while "next month" should
+                if m is not None and \
+                        inputString[startpos:startpos +
+                                    m.start()].strip() == '':
+                    debug and log.debug('CRE_UNITS_ONLY matched [%s]',
+                                        m.group())
+                    if leftmost_match[1] == 0 or \
+                            leftmost_match[0] > m.start() + startpos:
+                        leftmost_match[0] = m.start() + startpos
+                        leftmost_match[1] = m.end() + startpos
+                        leftmost_match[2] = m.group()
+                        leftmost_match[3] = 3
+                        leftmost_match[4] = 'unitsOnly'
+
+            # set the start position to the end pos of the leftmost match
+            startpos = leftmost_match[1]
+
+            # nothing was detected
+            # so break out of the loop
+            if startpos == 0:
+                startpos = len(inputString)
+            else:
+                if leftmost_match[3] > 0:
+                    m = self.ptc.CRE_NLP_PREFIX.search(
+                        inputString[:leftmost_match[0]] +
+                        ' ' + str(leftmost_match[3]))
+                    if m is not None:
+                        leftmost_match[0] = m.start('nlp_prefix')
+                        leftmost_match[2] = inputString[leftmost_match[0]:
+                                                        leftmost_match[1]]
+                matches.append(leftmost_match)
+
+        # find matches in proximity with one another and
+        # return all the parsed values
+        proximity_matches = []
+        if len(matches) > 1:
+            combined = ''
+            from_match_index = 0
+            date = matches[0][3] == 1
+            time = matches[0][3] == 2
+            units = matches[0][3] == 3
+            for i in range(1, len(matches)):
+
+                # test proximity (are there characters between matches?)
+                endofprevious = matches[i - 1][1]
+                begofcurrent = matches[i][0]
+                if orig_inputstring[endofprevious:
+                                    begofcurrent].lower().strip() != '':
+                    # this one isn't in proximity, but maybe
+                    # we have enough to make a datetime
+                    # TODO: make sure the combination of
+                    # formats (modifier, dateStd, etc) makes logical sense
+                    # before parsing together
+                    if date or time or units:
+                        combined = orig_inputstring[matches[from_match_index]
+                                                    [0]:matches[i - 1][1]]
+                        parsed_datetime, flags = self.parse(combined,
+                                                            sourceTime,
+                                                            version)
+                        proximity_matches.append((
+                            datetime.datetime(*parsed_datetime[:6]),
+                            flags,
+                            matches[from_match_index][0],
+                            matches[i - 1][1],
+                            combined))
+                    # not in proximity, reset starting from current
+                    from_match_index = i
+                    date = matches[i][3] == 1
+                    time = matches[i][3] == 2
+                    units = matches[i][3] == 3
+                    continue
+                else:
+                    if matches[i][3] == 1:
+                        date = True
+                    if matches[i][3] == 2:
+                        time = True
+                    if matches[i][3] == 3:
+                        units = True
+
+            # check last
+            # we have enough to make a datetime
+            if date or time or units:
+                combined = orig_inputstring[matches[from_match_index][0]:
+                                            matches[len(matches) - 1][1]]
+                parsed_datetime, flags = self.parse(combined, sourceTime,
+                                                    version)
+                proximity_matches.append((
+                    datetime.datetime(*parsed_datetime[:6]),
+                    flags,
+                    matches[from_match_index][0],
+                    matches[len(matches) - 1][1],
+                    combined))
+
+        elif len(matches) == 0:
+            return None
+        else:
+            if matches[0][3] == 0:  # not enough info to parse
+                return None
+            else:
+                combined = orig_inputstring[matches[0][0]:matches[0][1]]
+                parsed_datetime, flags = self.parse(matches[0][2], sourceTime,
+                                                    version)
+                proximity_matches.append((
+                    datetime.datetime(*parsed_datetime[:6]),
+                    flags,
+                    matches[0][0],
+                    matches[0][1],
+                    combined))
+
+        return tuple(proximity_matches)
+
+
+def _initSymbols(ptc):
+    """
+    Initialize symbols and single character constants.
+    """
+    # build am and pm lists to contain
+    # original case, lowercase, first-char and dotted
+    # versions of the meridian text
+    ptc.am = ['', '']
+    ptc.pm = ['', '']
+    for idx, xm in enumerate(ptc.locale.meridian[:2]):
+        # 0: am
+        # 1: pm
+        target = ['am', 'pm'][idx]
+        setattr(ptc, target, [xm])
+        target = getattr(ptc, target)
+        if xm:
+            lxm = xm.lower()
+            target.extend((xm[0], '{0}.{1}.'.format(*xm),
+                           lxm, lxm[0], '{0}.{1}.'.format(*lxm)))
+
+
+class Constants(object):
+
+    """
+    Default set of constants for parsedatetime.
+
+    If PyICU is present, then the class will first try to get PyICU
+    to return a locale specified by C{localeID}.  If either C{localeID} is
+    None or if the locale does not exist within PyICU, then each of the
+    locales defined in C{fallbackLocales} is tried in order.
+
+    If PyICU is not present or none of the specified locales can be used,
+    then the class will initialize itself to the en_US locale.
+
+    if PyICU is not present or not requested, only the locales defined by
+    C{pdtLocales} will be searched.
+    """
+
+    def __init__(self, localeID=None, usePyICU=True,
+                 fallbackLocales=['en_US']):
+        self.localeID = localeID
+        self.fallbackLocales = fallbackLocales[:]
+
+        if 'en_US' not in self.fallbackLocales:
+            self.fallbackLocales.append('en_US')
+
+        # define non-locale specific constants
+        self.locale = None
+        self.usePyICU = usePyICU
+
+        # starting cache of leap years
+        # daysInMonth will add to this if during
+        # runtime it gets a request for a year not found
+        self._leapYears = list(range(1904, 2097, 4))
+
+        self.Second = 1
+        self.Minute = 60  # 60 * self.Second
+        self.Hour = 3600  # 60 * self.Minute
+        self.Day = 86400  # 24 * self.Hour
+        self.Week = 604800  # 7   * self.Day
+        self.Month = 2592000  # 30  * self.Day
+        self.Year = 31536000  # 365 * self.Day
+
+        self._DaysInMonthList = (31, 28, 31, 30, 31, 30,
+                                 31, 31, 30, 31, 30, 31)
+        self.rangeSep = '-'
+        self.BirthdayEpoch = 50
+
+        # When True the starting time for all relative calculations will come
+        # from the given SourceTime, otherwise it will be 9am
+
+        self.StartTimeFromSourceTime = False
+
+        # YearParseStyle controls how we parse "Jun 12", i.e. dates that do
+        # not have a year present.  The default is to compare the date given
+        # to the current date, and if prior, then assume the next year.
+        # Setting this to 0 will prevent that.
+
+        self.YearParseStyle = 1
+
+        # DOWParseStyle controls how we parse "Tuesday"
+        # If the current day was Thursday and the text to parse is "Tuesday"
+        # then the following table shows how each style would be returned
+        # -1, 0, +1
+        #
+        # Current day marked as ***
+        #
+        #          Sun Mon Tue Wed Thu Fri Sat
+        # week -1
+        # current         -1,0     ***
+        # week +1          +1
+        #
+        # If the current day was Monday and the text to parse is "Tuesday"
+        # then the following table shows how each style would be returned
+        # -1, 0, +1
+        #
+        #          Sun Mon Tue Wed Thu Fri Sat
+        # week -1           -1
+        # current      *** 0,+1
+        # week +1
+
+        self.DOWParseStyle = 1
+
+        # CurrentDOWParseStyle controls how we parse "Friday"
+        # If the current day was Friday and the text to parse is "Friday"
+        # then the following table shows how each style would be returned
+        # True/False. This also depends on DOWParseStyle.
+        #
+        # Current day marked as ***
+        #
+        # DOWParseStyle = 0
+        #          Sun Mon Tue Wed Thu Fri Sat
+        # week -1
+        # current                      T,F
+        # week +1
+        #
+        # DOWParseStyle = -1
+        #          Sun Mon Tue Wed Thu Fri Sat
+        # week -1                       F
+        # current                       T
+        # week +1
+        #
+        # DOWParseStyle = +1
+        #
+        #          Sun Mon Tue Wed Thu Fri Sat
+        # week -1
+        # current                       T
+        # week +1                       F
+
+        self.CurrentDOWParseStyle = False
+
+        if self.usePyICU:
+            self.locale = get_icu(self.localeID)
+
+            if self.locale.icu is None:
+                self.usePyICU = False
+                self.locale = None
+
+        if self.locale is None:
+            if self.localeID not in pdtLocales:
+                for localeId in range(0, len(self.fallbackLocales)):
+                    self.localeID = self.fallbackLocales[localeId]
+                    if self.localeID in pdtLocales:
+                        break
+
+            self.locale = pdtLocales[self.localeID]
+
+        if self.locale is not None:
+
+            def _getLocaleDataAdjusted(localeData):
+                """
+                If localeData is defined as ["mon|mnd", 'tu|tues'...] then this
+                function splits those definitions on |
+                """
+                adjusted = []
+                for d in localeData:
+                    if '|' in d:
+                        adjusted += d.split("|")
+                    else:
+                        adjusted.append(d)
+                return adjusted
+
+            mths = _getLocaleDataAdjusted(self.locale.Months)
+            smths = _getLocaleDataAdjusted(self.locale.shortMonths)
+            swds = _getLocaleDataAdjusted(self.locale.shortWeekdays)
+            wds = _getLocaleDataAdjusted(self.locale.Weekdays)
+
+            re_join = lambda g: '|'.join(re.escape(i) for i in g)
+
+            # escape any regex special characters that may be found
+            self.locale.re_values['months'] = re_join(mths)
+            self.locale.re_values['shortmonths'] = re_join(smths)
+            self.locale.re_values['days'] = re_join(wds)
+            self.locale.re_values['shortdays'] = re_join(swds)
+            self.locale.re_values['dayoffsets'] = \
+                re_join(self.locale.dayOffsets)
+            self.locale.re_values['numbers'] = \
+                re_join(self.locale.numbers)
+            self.locale.re_values['decimal_mark'] = \
+                re.escape(self.locale.decimal_mark)
+
+            units = [unit for units in self.locale.units.values()
+                     for unit in units]  # flatten
+            units.sort(key=len, reverse=True)  # longest first
+            self.locale.re_values['units'] = re_join(units)
+            self.locale.re_values['modifiers'] = re_join(self.locale.Modifiers)
+            self.locale.re_values['sources'] = re_join(self.locale.re_sources)
+
+            # For distinguishing numeric dates from times, look for timeSep
+            # and meridian, if specified in the locale
+            self.locale.re_values['timecomponents'] = \
+                re_join(self.locale.timeSep + self.locale.meridian)
+
+            # build weekday offsets - yes, it assumes the Weekday and
+            # shortWeekday lists are in the same order and Mon..Sun
+            # (Python style)
+            def _buildOffsets(offsetDict, localeData, indexStart):
+                o = indexStart
+                for key in localeData:
+                    if '|' in key:
+                        for k in key.split('|'):
+                            offsetDict[k] = o
+                    else:
+                        offsetDict[key] = o
+                    o += 1
+
+            _buildOffsets(self.locale.WeekdayOffsets,
+                          self.locale.Weekdays, 0)
+            _buildOffsets(self.locale.WeekdayOffsets,
+                          self.locale.shortWeekdays, 0)
+
+            # build month offsets - yes, it assumes the Months and shortMonths
+            # lists are in the same order and Jan..Dec
+            _buildOffsets(self.locale.MonthOffsets,
+                          self.locale.Months, 1)
+            _buildOffsets(self.locale.MonthOffsets,
+                          self.locale.shortMonths, 1)
+
+        _initSymbols(self)
+
+        # TODO: add code to parse the date formats and build the regexes up
+        # from sub-parts, find all hard-coded uses of date/time separators
+
+        # not being used in code, but kept in case others are manually
+        # utilizing this regex for their own purposes
+        self.RE_DATE4 = r'''(?P<date>
+                                (
+                                    (
+                                        (?P<day>\d\d?)
+                                        (?P<suffix>{daysuffix})?
+                                        (,)?
+                                        (\s)?
+                                    )
+                                    (?P<mthname>
+                                        \b({months}|{shortmonths})\b
+                                    )\s?
+                                    (?P<year>\d\d
+                                        (\d\d)?
+                                    )?
+                                )
+                            )'''.format(**self.locale.re_values)
+
+        # still not completely sure of the behavior of the regex and
+        # whether it would be best to consume all possible irrelevant
+        # characters before the option groups (but within the {1,3} repetition
+        # group or inside of each option group, as it currently does
+        # however, right now, all tests are passing that were,
+        # including fixing the bug of matching a 4-digit year as ddyy
+        # when the day is absent from the string
+        self.RE_DATE3 = r'''(?P<date>
+                                (?:
+                                    (?:^|\s)
+                                    (?P<mthname>
+                                        {months}|{shortmonths}
+                                    )\b
+                                    |
+                                    (?:^|\s)
+                                    (?P<day>[1-9]|[012]\d|3[01])
+                                    (?P<suffix>{daysuffix}|)\b
+                                    (?!\s*(?:{timecomponents}))
+                                    |
+                                    ,?\s
+                                    (?P<year>\d\d(?:\d\d|))\b
+                                    (?!\s*(?:{timecomponents}))
+                                ){{1,3}}
+                                (?(mthname)|$-^)
+                            )'''.format(**self.locale.re_values)
+
+        # not being used in code, but kept in case others are manually
+        # utilizing this regex for their own purposes
+        self.RE_MONTH = r'''(\s|^)
+                            (?P<month>
+                                (
+                                    (?P<mthname>
+                                        \b({months}|{shortmonths})\b
+                                    )
+                                    (\s?
+                                        (?P<year>(\d{{4}}))
+                                    )?
+                                )
+                            )
+                            (?=\s|$|[^\w])'''.format(**self.locale.re_values)
+
+        self.RE_WEEKDAY = r'''\b
+                              (?:
+                                  {days}|{shortdays}
+                              )
+                              \b'''.format(**self.locale.re_values)
+
+        self.RE_NUMBER = (r'(\b(?:{numbers})\b|\d+(?:{decimal_mark}\d+|))'
+                          .format(**self.locale.re_values))
+
+        self.RE_SPECIAL = (r'(?P<special>^[{specials}]+)\s+'
+                           .format(**self.locale.re_values))
+
+        self.RE_UNITS_ONLY = (r'''\b({units})\b'''
+                              .format(**self.locale.re_values))
+
+        self.RE_UNITS = r'''\b(?P<qty>
+                                -?
+                                (?:\d+(?:{decimal_mark}\d+|)|(?:{numbers})\b)\s*
+                                (?P<units>{units})
+                            )\b'''.format(**self.locale.re_values)
+
+        self.RE_QUNITS = r'''\b(?P<qty>
+                                 -?
+                                 (?:\d+(?:{decimal_mark}\d+|)|(?:{numbers})s)\s?
+                                 (?P<qunits>{qunits})
+                             )\b'''.format(**self.locale.re_values)
+
+        self.RE_MODIFIER = r'''\b(?:
+                                   {modifiers}
+                               )\b'''.format(**self.locale.re_values)
+
+        self.RE_TIMEHMS = r'''([\s(\["'-]|^)
+                              (?P<hours>\d\d?)
+                              (?P<tsep>{timeseparator}|)
+                              (?P<minutes>\d\d)
+                              (?:(?P=tsep)
+                                  (?P<seconds>\d\d
+                                      (?:[\.,]\d+)?
+                                  )
+                              )?\b'''.format(**self.locale.re_values)
+
+        self.RE_TIMEHMS2 = r'''([\s(\["'-]|^)
+                               (?P<hours>\d\d?)
+                               (?:
+                                   (?P<tsep>{timeseparator}|)
+                                   (?P<minutes>\d\d?)
+                                   (?:(?P=tsep)
+                                       (?P<seconds>\d\d?
+                                           (?:[\.,]\d+)?
+                                       )
+                                   )?
+                               )?'''.format(**self.locale.re_values)
+
+        # 1, 2, and 3 here refer to the type of match date, time, or units
+        self.RE_NLP_PREFIX = r'''\b(?P<nlp_prefix>
+                                  (on)
+                                  (\s)+1
+                                  |
+                                  (at|in)
+                                  (\s)+2
+                                  |
+                                  (in)
+                                  (\s)+3
+                                 )'''
+
+        if 'meridian' in self.locale.re_values:
+            self.RE_TIMEHMS2 += (r'\s?(?P<meridian>{meridian})\b'
+                                 .format(**self.locale.re_values))
+        else:
+            self.RE_TIMEHMS2 += r'\b'
+
+        # Always support common . and - separators
+        dateSeps = ''.join(re.escape(s)
+                           for s in self.locale.dateSep + ['-', '.'])
+
+        self.RE_DATE = r'''([\s(\["'-]|^)
+                           (?P<date>
+                                \d\d?[{0}]\d\d?(?:[{0}]\d\d(?:\d\d)?)?
+                                |
+                                \d{{4}}[{0}]\d\d?[{0}]\d\d?
+                            )
+                           \b'''.format(dateSeps)
+
+        self.RE_DATE2 = r'[{0}]'.format(dateSeps)
+
+        assert 'dayoffsets' in self.locale.re_values
+
+        self.RE_DAY = r'''\b
+                          (?:
+                              {dayoffsets}
+                          )
+                          \b'''.format(**self.locale.re_values)
+
+        self.RE_DAY2 = r'''(?P<day>\d\d?)
+                           (?P<suffix>{daysuffix})?
+                       '''.format(**self.locale.re_values)
+
+        self.RE_TIME = r'''\b
+                           (?:
+                               {sources}
+                           )
+                           \b'''.format(**self.locale.re_values)
+
+        self.RE_REMAINING = r'\s+'
+
+        # Regex for date/time ranges
+        self.RE_RTIMEHMS = r'''(\s?|^)
+                               (\d\d?){timeseparator}
+                               (\d\d)
+                               ({timeseparator}(\d\d))?
+                               (\s?|$)'''.format(**self.locale.re_values)
+
+        self.RE_RTIMEHMS2 = (r'''(\s?|^)
+                                 (\d\d?)
+                                 ({timeseparator}(\d\d?))?
+                                 ({timeseparator}(\d\d?))?'''
+                             .format(**self.locale.re_values))
+
+        if 'meridian' in self.locale.re_values:
+            self.RE_RTIMEHMS2 += (r'\s?({meridian})'
+                                  .format(**self.locale.re_values))
+
+        self.RE_RDATE = r'(\d+([%s]\d+)+)' % dateSeps
+        self.RE_RDATE3 = r'''(
+                                (
+                                    (
+                                        \b({months})\b
+                                    )\s?
+                                    (
+                                        (\d\d?)
+                                        (\s?|{daysuffix}|$)+
+                                    )?
+                                    (,\s?\d{{4}})?
+                                )
+                            )'''.format(**self.locale.re_values)
+
+        # "06/07/06 - 08/09/06"
+        self.DATERNG1 = (r'{0}\s?{rangeseparator}\s?{0}'
+                         .format(self.RE_RDATE, **self.locale.re_values))
+
+        # "march 31 - june 1st, 2006"
+        self.DATERNG2 = (r'{0}\s?{rangeseparator}\s?{0}'
+                         .format(self.RE_RDATE3, **self.locale.re_values))
+
+        # "march 1rd -13th"
+        self.DATERNG3 = (r'{0}\s?{rangeseparator}\s?(\d\d?)\s?(rd|st|nd|th)?'
+                         .format(self.RE_RDATE3, **self.locale.re_values))
+
+        # "4:00:55 pm - 5:90:44 am", '4p-5p'
+        self.TIMERNG1 = (r'{0}\s?{rangeseparator}\s?{0}'
+                         .format(self.RE_RTIMEHMS2, **self.locale.re_values))
+
+        self.TIMERNG2 = (r'{0}\s?{rangeseparator}\s?{0}'
+                         .format(self.RE_RTIMEHMS, **self.locale.re_values))
+
+        # "4-5pm "
+        self.TIMERNG3 = (r'\d\d?\s?{rangeseparator}\s?{0}'
+                         .format(self.RE_RTIMEHMS2, **self.locale.re_values))
+
+        # "4:30-5pm "
+        self.TIMERNG4 = (r'{0}\s?{rangeseparator}\s?{1}'
+                         .format(self.RE_RTIMEHMS, self.RE_RTIMEHMS2,
+                                 **self.locale.re_values))
+
+        self.re_option = re.IGNORECASE + re.VERBOSE
+        self.cre_source = {'CRE_SPECIAL': self.RE_SPECIAL,
+                           'CRE_NUMBER': self.RE_NUMBER,
+                           'CRE_UNITS': self.RE_UNITS,
+                           'CRE_UNITS_ONLY': self.RE_UNITS_ONLY,
+                           'CRE_QUNITS': self.RE_QUNITS,
+                           'CRE_MODIFIER': self.RE_MODIFIER,
+                           'CRE_TIMEHMS': self.RE_TIMEHMS,
+                           'CRE_TIMEHMS2': self.RE_TIMEHMS2,
+                           'CRE_DATE': self.RE_DATE,
+                           'CRE_DATE2': self.RE_DATE2,
+                           'CRE_DATE3': self.RE_DATE3,
+                           'CRE_DATE4': self.RE_DATE4,
+                           'CRE_MONTH': self.RE_MONTH,
+                           'CRE_WEEKDAY': self.RE_WEEKDAY,
+                           'CRE_DAY': self.RE_DAY,
+                           'CRE_DAY2': self.RE_DAY2,
+                           'CRE_TIME': self.RE_TIME,
+                           'CRE_REMAINING': self.RE_REMAINING,
+                           'CRE_RTIMEHMS': self.RE_RTIMEHMS,
+                           'CRE_RTIMEHMS2': self.RE_RTIMEHMS2,
+                           'CRE_RDATE': self.RE_RDATE,
+                           'CRE_RDATE3': self.RE_RDATE3,
+                           'CRE_TIMERNG1': self.TIMERNG1,
+                           'CRE_TIMERNG2': self.TIMERNG2,
+                           'CRE_TIMERNG3': self.TIMERNG3,
+                           'CRE_TIMERNG4': self.TIMERNG4,
+                           'CRE_DATERNG1': self.DATERNG1,
+                           'CRE_DATERNG2': self.DATERNG2,
+                           'CRE_DATERNG3': self.DATERNG3,
+                           'CRE_NLP_PREFIX': self.RE_NLP_PREFIX}
+        self.cre_keys = set(self.cre_source.keys())
+
+    def __getattr__(self, name):
+        if name in self.cre_keys:
+            value = re.compile(self.cre_source[name], self.re_option)
+            setattr(self, name, value)
+            return value
+        elif name in self.locale.locale_keys:
+            return getattr(self.locale, name)
+        else:
+            raise AttributeError(name)
+
+    def daysInMonth(self, month, year):
+        """
+        Take the given month (1-12) and a given year (4 digit) return
+        the number of days in the month adjusting for leap year as needed
+        """
+        result = None
+        debug and log.debug('daysInMonth(%s, %s)', month, year)
+        if month > 0 and month <= 12:
+            result = self._DaysInMonthList[month - 1]
+
+            if month == 2:
+                if year in self._leapYears:
+                    result += 1
+                else:
+                    if calendar.isleap(year):
+                        self._leapYears.append(year)
+                        result += 1
+
+        return result
+
+    def getSource(self, sourceKey, sourceTime=None):
+        """
+        GetReturn a date/time tuple based on the giving source key
+        and the corresponding key found in self.re_sources.
+
+        The current time is used as the default and any specified
+        item found in self.re_sources is inserted into the value
+        and the generated dictionary is returned.
+        """
+        if sourceKey not in self.re_sources:
+            return None
+
+        if sourceTime is None:
+            (yr, mth, dy, hr, mn, sec, wd, yd, isdst) = time.localtime()
+        else:
+            (yr, mth, dy, hr, mn, sec, wd, yd, isdst) = sourceTime
+
+        defaults = {'yr': yr, 'mth': mth, 'dy': dy,
+                    'hr': hr, 'mn': mn, 'sec': sec}
+
+        source = self.re_sources[sourceKey]
+
+        values = {}
+
+        for key, default in defaults.items():
+            values[key] = source.get(key, default)
+
+        return (values['yr'], values['mth'], values['dy'],
+                values['hr'], values['mn'], values['sec'],
+                wd, yd, isdst)