app/django/utils/dateformat.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sun, 16 Nov 2008 23:03:37 +0000
changeset 494 5e9c656a1b68
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Refactored SiteMap to be generic With this mechanism (in combination with the new sidebar) in place adding a new entity to the site becomes very easy, rather than having to add a lot of code to 'map.py', one can simply register with the sitemap modules.
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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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   154
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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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   158
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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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   216
        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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   234
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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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   245
        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)