bazarr/libs/aniso8601/utcoffset.py

72 lines
2.4 KiB
Python

# -*- coding: utf-8 -*-
# Copyright (c) 2021, Brandon Nielsen
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
import datetime
class UTCOffset(datetime.tzinfo):
def __init__(self, name=None, minutes=None):
# We build an offset in this manner since the
# tzinfo class must have an init
# "method that can be called with no arguments"
self._name = name
if minutes is not None:
self._utcdelta = datetime.timedelta(minutes=minutes)
else:
self._utcdelta = None
def __repr__(self):
if self._utcdelta >= datetime.timedelta(hours=0):
return "+{0} UTC".format(self._utcdelta)
# From the docs:
# String representations of timedelta objects are normalized
# similarly to their internal representation. This leads to
# somewhat unusual results for negative timedeltas.
# Clean this up for printing purposes
# Negative deltas start at -1 day
correcteddays = abs(self._utcdelta.days + 1)
# Negative deltas have a positive seconds
deltaseconds = (24 * 60 * 60) - self._utcdelta.seconds
# (24 hours / day) * (60 minutes / hour) * (60 seconds / hour)
days, remainder = divmod(deltaseconds, 24 * 60 * 60)
# (1 hour) * (60 minutes / hour) * (60 seconds / hour)
hours, remainder = divmod(remainder, 1 * 60 * 60)
# (1 minute) * (60 seconds / minute)
minutes, seconds = divmod(remainder, 1 * 60)
# Add any remaining days to the correcteddays count
correcteddays += days
if correcteddays == 0:
return "-{0}:{1:02}:{2:02} UTC".format(hours, minutes, seconds)
elif correcteddays == 1:
return "-1 day, {0}:{1:02}:{2:02} UTC".format(hours, minutes, seconds)
return "-{0} days, {1}:{2:02}:{3:02} UTC".format(
correcteddays, hours, minutes, seconds
)
def utcoffset(self, dt):
return self._utcdelta
def tzname(self, dt):
return self._name
def dst(self, dt):
# ISO 8601 specifies offsets should be different if DST is required,
# instead of allowing for a DST to be specified
# https://docs.python.org/2/library/datetime.html#datetime.tzinfo.dst
return datetime.timedelta(0)