368 lines
11 KiB
Python
368 lines
11 KiB
Python
"""
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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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import calendar
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import datetime
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import re
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import time
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from django.utils.dates import (
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MONTHS, MONTHS_3, MONTHS_ALT, MONTHS_AP, WEEKDAYS, WEEKDAYS_ABBR,
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)
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from django.utils.timezone import get_default_timezone, is_aware, is_naive
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from django.utils.translation import gettext as _
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re_formatchars = re.compile(r'(?<!\\)([aAbBcdDeEfFgGhHiIjlLmMnNoOPrsStTUuwWyYzZ])')
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re_escaped = re.compile(r'\\(.)')
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class Formatter:
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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(str(formatstr))):
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if i % 2:
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if type(self.data) is datetime.date and hasattr(TimeFormat, piece):
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raise TypeError(
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"The format for date objects may not contain "
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"time-related format specifiers (found '%s')." % piece
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)
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pieces.append(str(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 ''.join(pieces)
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class TimeFormat(Formatter):
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def __init__(self, obj):
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self.data = obj
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self.timezone = None
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# We only support timezone when formatting datetime objects,
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# not date objects (timezone information not appropriate),
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# or time objects (against established django policy).
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if isinstance(obj, datetime.datetime):
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if is_naive(obj):
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self.timezone = get_default_timezone()
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else:
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self.timezone = obj.tzinfo
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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('may be implemented in a future release')
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def e(self):
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"""
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Timezone name.
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If timezone information is not available, return an empty string.
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"""
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if not self.timezone:
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return ""
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try:
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if hasattr(self.data, 'tzinfo') and self.data.tzinfo:
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return self.data.tzname() or ''
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except NotImplementedError:
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pass
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return ""
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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 '%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 '%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 '%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 '%02d' % self.data.minute
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def O(self): # NOQA: E743
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"""
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Difference to Greenwich time in hours; e.g. '+0200', '-0430'.
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If timezone information is not available, return an empty string.
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"""
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if not self.timezone:
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return ""
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seconds = self.Z()
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if seconds == "":
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return ""
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sign = '-' if seconds < 0 else '+'
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seconds = abs(seconds)
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return "%s%02d%02d" % (sign, seconds // 3600, (seconds // 60) % 60)
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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 '%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 '%02d' % self.data.second
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def T(self):
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"""
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Time zone of this machine; e.g. 'EST' or 'MDT'.
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If timezone information is not available, return an empty string.
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"""
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if not self.timezone:
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return ""
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name = None
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try:
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name = self.timezone.tzname(self.data)
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except Exception:
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# pytz raises AmbiguousTimeError during the autumn DST change.
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# This happens mainly when __init__ receives a naive datetime
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# and sets self.timezone = get_default_timezone().
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pass
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if name is None:
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name = self.format('O')
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return str(name)
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def u(self):
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"Microseconds; i.e. '000000' to '999999'"
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return '%06d' % self.data.microsecond
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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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timezones west of UTC is always negative, and for those east of UTC is
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always positive.
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If timezone information is not available, return an empty string.
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"""
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if not self.timezone:
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return ""
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try:
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offset = self.timezone.utcoffset(self.data)
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except Exception:
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# pytz raises AmbiguousTimeError during the autumn DST change.
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# This happens mainly when __init__ receives a naive datetime
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# and sets self.timezone = get_default_timezone().
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return ""
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# `offset` is a datetime.timedelta. For negative values (to the west of
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# UTC) only days can be negative (days=-1) and seconds are always
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# positive. e.g. UTC-1 -> timedelta(days=-1, seconds=82800, microseconds=0)
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# Positive offsets have days=0
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return offset.days * 86400 + offset.seconds
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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 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 c(self):
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"""
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ISO 8601 Format
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Example : '2008-01-02T10:30:00.000123'
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"""
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return self.data.isoformat()
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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 '%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 E(self):
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"Alternative month names as required by some locales. Proprietary extension."
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return MONTHS_ALT[self.data.month]
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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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def I(self): # NOQA: E743
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"'1' if Daylight Savings Time, '0' otherwise."
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try:
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if self.timezone and self.timezone.dst(self.data):
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return '1'
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else:
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return '0'
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except Exception:
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# pytz raises AmbiguousTimeError during the autumn DST change.
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# This happens mainly when __init__ receives a naive datetime
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# and sets self.timezone = get_default_timezone().
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return ''
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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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def l(self): # NOQA: E743
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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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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 calendar.isleap(self.data.year)
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def m(self):
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"Month; i.e. '01' to '12'"
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return '%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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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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"ISO 8601 year number matching the ISO week number (W)"
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return self.data.isocalendar()[0]
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def r(self):
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"RFC 5322 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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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 'th'
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last = self.data.day % 10
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if last == 1:
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return 'st'
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if last == 2:
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return 'nd'
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if last == 3:
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return 'rd'
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return 'th'
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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 '%02d' % calendar.monthrange(self.data.year, self.data.month)[1]
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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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if isinstance(self.data, datetime.datetime) and is_aware(self.data):
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return int(calendar.timegm(self.data.utctimetuple()))
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else:
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return int(time.mktime(self.data.timetuple()))
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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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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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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 calendar.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 calendar.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 str(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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return self.data.year
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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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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 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)
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