/usr/lib/python3/dist-packages/isodate/tzinfo.py is in python3-isodate 0.4.6-1.
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This module provides some datetime.tzinfo implementations.
All those classes are taken from the Python documentation.
'''
from datetime import timedelta, tzinfo
import time
ZERO = timedelta(0)
# constant for zero time offset.
class Utc(tzinfo):
'''UTC
Universal time coordinated time zone.
'''
def utcoffset(self, dt):
'''
Return offset from UTC in minutes east of UTC, which is ZERO for UTC.
'''
return ZERO
def tzname(self, dt):
'''
Return the time zone name corresponding to the datetime object dt, as a string.
'''
return "UTC"
def dst(self, dt):
'''
Return the daylight saving time (DST) adjustment, in minutes east of UTC.
'''
return ZERO
UTC = Utc()
# the default instance for UTC.
class FixedOffset(tzinfo):
'''
A class building tzinfo objects for fixed-offset time zones.
Note that FixedOffset(0, "UTC") is a different way to build a
UTC tzinfo object.
'''
def __init__(self, offset_hours, offset_minutes, name):
'''
Initialise an instance with time offset and name.
The time offset should be positive for time zones east of UTC
and negate for time zones west of UTC.
'''
self.__offset = timedelta(hours=offset_hours, minutes=offset_minutes)
self.__name = name
def utcoffset(self, dt):
'''
Return offset from UTC in minutes of UTC.
'''
return self.__offset
def tzname(self, dt):
'''
Return the time zone name corresponding to the datetime object dt, as a
string.
'''
return self.__name
def dst(self, dt):
'''
Return the daylight saving time (DST) adjustment, in minutes east of
UTC.
'''
return ZERO
def __repr__(self):
'''
Return nicely formatted repr string.
'''
return "<FixedOffset %r>" % self.__name
STDOFFSET = timedelta(seconds = -time.timezone)
# locale time zone offset
# calculate local daylight saving offset if any.
if time.daylight:
DSTOFFSET = timedelta(seconds = -time.altzone)
else:
DSTOFFSET = STDOFFSET
DSTDIFF = DSTOFFSET - STDOFFSET
# difference between local time zone and local DST time zone
class LocalTimezone(tzinfo):
'''
A class capturing the platform's idea of local time.
'''
def utcoffset(self, dt):
'''
Return offset from UTC in minutes of UTC.
'''
if self._isdst(dt):
return DSTOFFSET
else:
return STDOFFSET
def dst(self, dt):
'''
Return daylight saving offset.
'''
if self._isdst(dt):
return DSTDIFF
else:
return ZERO
def tzname(self, dt):
'''
Return the time zone name corresponding to the datetime object dt, as a
string.
'''
return time.tzname[self._isdst(dt)]
def _isdst(self, dt):
'''
Returns true if DST is active for given datetime object dt.
'''
tt = (dt.year, dt.month, dt.day,
dt.hour, dt.minute, dt.second,
dt.weekday(), 0, -1)
stamp = time.mktime(tt)
tt = time.localtime(stamp)
return tt.tm_isdst > 0
LOCAL = LocalTimezone()
# the default instance for local time zone.
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