+
−"Implementation of tzinfo classes for use with datetime.datetime."
+
−
+
−import locale
+
−import time
+
−from datetime import timedelta, tzinfo
+
−from django.utils.encoding import smart_unicode
+
−
+
−try:
+
−    DEFAULT_ENCODING = locale.getdefaultlocale()[1] or 'ascii'
+
−except:
+
−    # Any problems at all determining the locale and we fallback. See #5846.
+
−    DEFAULT_ENCODING = 'ascii'
+
−
+
−class FixedOffset(tzinfo):
+
−    "Fixed offset in minutes east from UTC."
+
−    def __init__(self, offset):
+
−        if isinstance(offset, timedelta):
+
−            self.__offset = offset
+
−            offset = self.__offset.seconds // 60
+
−        else:
+
−            self.__offset = timedelta(minutes=offset)
+
−
+
−        self.__name = u"%+03d%02d" % (offset / 60, offset % 60)
+
−
+
−    def __repr__(self):
+
−        return self.__name
+
−
+
−    def utcoffset(self, dt):
+
−        return self.__offset
+
−
+
−    def tzname(self, dt):
+
−        return self.__name
+
−
+
−    def dst(self, dt):
+
−        return timedelta(0)
+
−
+
−class LocalTimezone(tzinfo):
+
−    "Proxy timezone information from time module."
+
−    def __init__(self, dt):
+
−        tzinfo.__init__(self)
+
−        self._tzname = self.tzname(dt)
+
−
+
−    def __repr__(self):
+
−        return self._tzname
+
−
+
−    def utcoffset(self, dt):
+
−        if self._isdst(dt):
+
−            return timedelta(seconds=-time.altzone)
+
−        else:
+
−            return timedelta(seconds=-time.timezone)
+
−
+
−    def dst(self, dt):
+
−        if self._isdst(dt):
+
−            return timedelta(seconds=-time.altzone) - timedelta(seconds=-time.timezone)
+
−        else:
+
−            return timedelta(0)
+
−
+
−    def tzname(self, dt):
+
−        try:
+
−            return smart_unicode(time.tzname[self._isdst(dt)], DEFAULT_ENCODING)
+
−        except UnicodeDecodeError:
+
−            return None
+
−
+
−    def _isdst(self, dt):
+
−        tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1)
+
−        try:
+
−            stamp = time.mktime(tt)
+
−        except (OverflowError, ValueError):
+
−            # 32 bit systems can't handle dates after Jan 2038, and certain
+
−            # systems can't handle dates before ~1901-12-01:
+
−            #
+
−            # >>> time.mktime((1900, 1, 13, 0, 0, 0, 0, 0, 0))
+
−            # OverflowError: mktime argument out of range
+
−            # >>> time.mktime((1850, 1, 13, 0, 0, 0, 0, 0, 0))
+
−            # ValueError: year out of range
+
−            #
+
−            # In this case, we fake the date, because we only care about the
+
−            # DST flag.
+
−            tt = (2037,) + tt[1:]
+
−            stamp = time.mktime(tt)
+
−        tt = time.localtime(stamp)
+
−        return tt.tm_isdst > 0