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# Copyright (c) 2014, Menno Smits
# Released subject to the New BSD License
# Please see http://en.wikipedia.org/wiki/BSD_licenses
import datetime
import time
from typing import Optional
ZERO = datetime.timedelta(0)
class FixedOffset(datetime.tzinfo):
"""
This class describes fixed timezone offsets in hours and minutes
east from UTC
"""
def __init__(self, minutes: float) -> None:
self.__offset = datetime.timedelta(minutes=minutes)
sign = "+"
if minutes < 0:
sign = "-"
hours, remaining_mins = divmod(abs(minutes), 60)
self.__name = "%s%02d%02d" % (sign, hours, remaining_mins)
def utcoffset(self, _: Optional[datetime.datetime]) -> datetime.timedelta:
return self.__offset
def tzname(self, _: Optional[datetime.datetime]) -> str:
return self.__name
def dst(self, _: Optional[datetime.datetime]) -> datetime.timedelta:
return ZERO
@classmethod
def for_system(cls) -> "FixedOffset":
"""Return a FixedOffset instance for the current working timezone and
DST conditions.
"""
if time.localtime().tm_isdst and time.daylight:
offset = time.altzone
else:
offset = time.timezone
return cls(-offset // 60)
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