app/django/utils/dateformat.py
author Todd Larsen <tlarsen@google.com>
Mon, 27 Oct 2008 19:19:44 +0000
changeset 426 114fe0f840c8
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Add tooltips style display of help_text, instead of widening the form with another (often ridiculously large) column. Also, version the .css and .js files so that browsers won't display the wrong cached one when we change something. Patch by: Dmitri Gaskin, Todd Larsen Review by: Todd Larsen
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"""
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PHP date() style date formatting
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See http://www.php.net/date for format strings
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Usage:
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>>> import datetime
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>>> d = datetime.datetime.now()
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>>> df = DateFormat(d)
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>>> print df.format('jS F Y H:i')
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7th October 2003 11:39
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>>>
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"""
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from django.utils.dates import MONTHS, MONTHS_3, MONTHS_AP, WEEKDAYS, WEEKDAYS_ABBR
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from django.utils.tzinfo import LocalTimezone
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from django.utils.translation import ugettext as _
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from django.utils.encoding import force_unicode
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from calendar import isleap, monthrange
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import re, time
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re_formatchars = re.compile(r'(?<!\\)([aAbBdDfFgGhHiIjlLmMnNOPrsStTUwWyYzZ])')
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re_escaped = re.compile(r'\\(.)')
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class Formatter(object):
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    def format(self, formatstr):
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        pieces = []
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        for i, piece in enumerate(re_formatchars.split(force_unicode(formatstr))):
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            if i % 2:
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                pieces.append(force_unicode(getattr(self, piece)()))
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            elif piece:
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                pieces.append(re_escaped.sub(r'\1', piece))
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        return u''.join(pieces)
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class TimeFormat(Formatter):
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    def __init__(self, t):
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        self.data = t
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    def a(self):
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        "'a.m.' or 'p.m.'"
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        if self.data.hour > 11:
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            return _('p.m.')
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        return _('a.m.')
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    def A(self):
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        "'AM' or 'PM'"
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        if self.data.hour > 11:
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            return _('PM')
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        return _('AM')
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    def B(self):
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        "Swatch Internet time"
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        raise NotImplementedError
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    def f(self):
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        """
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        Time, in 12-hour hours and minutes, with minutes left off if they're
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        zero.
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        Examples: '1', '1:30', '2:05', '2'
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        Proprietary extension.
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        """
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        if self.data.minute == 0:
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            return self.g()
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        return u'%s:%s' % (self.g(), self.i())
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    def g(self):
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        "Hour, 12-hour format without leading zeros; i.e. '1' to '12'"
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        if self.data.hour == 0:
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            return 12
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        if self.data.hour > 12:
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            return self.data.hour - 12
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        return self.data.hour
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    def G(self):
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        "Hour, 24-hour format without leading zeros; i.e. '0' to '23'"
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        return self.data.hour
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    def h(self):
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        "Hour, 12-hour format; i.e. '01' to '12'"
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        return u'%02d' % self.g()
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    def H(self):
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        "Hour, 24-hour format; i.e. '00' to '23'"
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        return u'%02d' % self.G()
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    def i(self):
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        "Minutes; i.e. '00' to '59'"
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        return u'%02d' % self.data.minute
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    def P(self):
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        """
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        Time, in 12-hour hours, minutes and 'a.m.'/'p.m.', with minutes left off
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        if they're zero and the strings 'midnight' and 'noon' if appropriate.
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        Examples: '1 a.m.', '1:30 p.m.', 'midnight', 'noon', '12:30 p.m.'
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        Proprietary extension.
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        """
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        if self.data.minute == 0 and self.data.hour == 0:
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            return _('midnight')
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        if self.data.minute == 0 and self.data.hour == 12:
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            return _('noon')
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        return u'%s %s' % (self.f(), self.a())
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    def s(self):
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        "Seconds; i.e. '00' to '59'"
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        return u'%02d' % self.data.second
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class DateFormat(TimeFormat):
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    year_days = [None, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
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    def __init__(self, dt):
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        # Accepts either a datetime or date object.
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        self.data = dt
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        self.timezone = getattr(dt, 'tzinfo', None)
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        if hasattr(self.data, 'hour') and not self.timezone:
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            self.timezone = LocalTimezone(dt)
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    def b(self):
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        "Month, textual, 3 letters, lowercase; e.g. 'jan'"
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        return MONTHS_3[self.data.month]
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    def d(self):
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        "Day of the month, 2 digits with leading zeros; i.e. '01' to '31'"
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        return u'%02d' % self.data.day
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    def D(self):
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        "Day of the week, textual, 3 letters; e.g. 'Fri'"
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        return WEEKDAYS_ABBR[self.data.weekday()]
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    def F(self):
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        "Month, textual, long; e.g. 'January'"
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        return MONTHS[self.data.month]
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   131
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    def I(self):
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        "'1' if Daylight Savings Time, '0' otherwise."
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        if self.timezone.dst(self.data):
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            return u'1'
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        else:
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            return u'0'
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   138
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    def j(self):
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        "Day of the month without leading zeros; i.e. '1' to '31'"
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        return self.data.day
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   142
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    def l(self):
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        "Day of the week, textual, long; e.g. 'Friday'"
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        return WEEKDAYS[self.data.weekday()]
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   146
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    def L(self):
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        "Boolean for whether it is a leap year; i.e. True or False"
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        return isleap(self.data.year)
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   150
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    def m(self):
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        "Month; i.e. '01' to '12'"
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        return u'%02d' % self.data.month
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    def M(self):
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        "Month, textual, 3 letters; e.g. 'Jan'"
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        return MONTHS_3[self.data.month].title()
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    def n(self):
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        "Month without leading zeros; i.e. '1' to '12'"
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        return self.data.month
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   162
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    def N(self):
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        "Month abbreviation in Associated Press style. Proprietary extension."
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        return MONTHS_AP[self.data.month]
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    def O(self):
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        "Difference to Greenwich time in hours; e.g. '+0200'"
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        seconds = self.Z()
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        return u"%+03d%02d" % (seconds // 3600, (seconds // 60) % 60)
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   171
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    def r(self):
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        "RFC 2822 formatted date; e.g. 'Thu, 21 Dec 2000 16:01:07 +0200'"
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        return self.format('D, j M Y H:i:s O')
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   175
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    def S(self):
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        "English ordinal suffix for the day of the month, 2 characters; i.e. 'st', 'nd', 'rd' or 'th'"
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        if self.data.day in (11, 12, 13): # Special case
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            return u'th'
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        last = self.data.day % 10
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        if last == 1:
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            return u'st'
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        if last == 2:
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            return u'nd'
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        if last == 3:
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            return u'rd'
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        return u'th'
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   188
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    def t(self):
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        "Number of days in the given month; i.e. '28' to '31'"
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        return u'%02d' % monthrange(self.data.year, self.data.month)[1]
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   192
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    def T(self):
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        "Time zone of this machine; e.g. 'EST' or 'MDT'"
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        name = self.timezone.tzname(self.data)
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        if name is None:
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            name = self.format('O')
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        return unicode(name)
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   199
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    def U(self):
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        "Seconds since the Unix epoch (January 1 1970 00:00:00 GMT)"
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        off = self.timezone.utcoffset(self.data)
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        return int(time.mktime(self.data.timetuple())) + off.seconds * 60
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   204
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    def w(self):
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        "Day of the week, numeric, i.e. '0' (Sunday) to '6' (Saturday)"
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        return (self.data.weekday() + 1) % 7
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   208
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    def W(self):
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        "ISO-8601 week number of year, weeks starting on Monday"
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        # Algorithm from http://www.personal.ecu.edu/mccartyr/ISOwdALG.txt
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        week_number = None
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        jan1_weekday = self.data.replace(month=1, day=1).weekday() + 1
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        weekday = self.data.weekday() + 1
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        day_of_year = self.z()
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        if day_of_year <= (8 - jan1_weekday) and jan1_weekday > 4:
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            if jan1_weekday == 5 or (jan1_weekday == 6 and isleap(self.data.year-1)):
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                week_number = 53
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            else:
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                week_number = 52
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        else:
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            if isleap(self.data.year):
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                i = 366
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            else:
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                i = 365
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            if (i - day_of_year) < (4 - weekday):
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                week_number = 1
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            else:
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                j = day_of_year + (7 - weekday) + (jan1_weekday - 1)
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                week_number = j // 7
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                if jan1_weekday > 4:
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                    week_number -= 1
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        return week_number
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    def y(self):
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        "Year, 2 digits; e.g. '99'"
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        return unicode(self.data.year)[2:]
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    def Y(self):
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        "Year, 4 digits; e.g. '1999'"
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   241
        return self.data.year
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   242
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    def z(self):
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        "Day of the year; i.e. '0' to '365'"
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        doy = self.year_days[self.data.month] + self.data.day
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   246
        if self.L() and self.data.month > 2:
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            doy += 1
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        return doy
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    def Z(self):
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        """
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        Time zone offset in seconds (i.e. '-43200' to '43200'). The offset for
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   253
        timezones west of UTC is always negative, and for those east of UTC is
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        always positive.
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        """
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        offset = self.timezone.utcoffset(self.data)
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        # Only days can be negative, so negative offsets have days=-1 and
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        # seconds positive. Positive offsets have days=0
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        return offset.days * 86400 + offset.seconds
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def format(value, format_string):
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    "Convenience function"
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    df = DateFormat(value)
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    return df.format(format_string)
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def time_format(value, format_string):
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    "Convenience function"
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    tf = TimeFormat(value)
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    return tf.format(format_string)