mirror of
https://github.com/django/django.git
synced 2024-12-27 03:25:58 +00:00
34008aaeb0
git-svn-id: http://code.djangoproject.com/svn/django/trunk@8216 bcc190cf-cafb-0310-a4f2-bffc1f526a37
83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
"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, dt)
|
|
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
|