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# -*- coding: utf-8 -*-
# Copyright (c) 2014, 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
def parse_timezone(tzstr):
#tzstr can be ±hh:mm, ±hhmm, ±hh, the Z case is handled elsewhere
tzstrlen = len(tzstr)
if tzstrlen == 6:
#±hh:mm
tzhour = int(tzstr[1:3])
tzminute = int(tzstr[4:6])
if tzstr[0] == '+':
return build_utcoffset(tzstr, datetime.timedelta(hours=tzhour, minutes=tzminute))
else:
if tzhour == 0 and tzminute == 0:
raise ValueError('String is not a valid ISO8601 time offset.')
else:
return build_utcoffset(tzstr, -datetime.timedelta(hours=tzhour, minutes=tzminute))
elif tzstrlen == 5:
#±hhmm
tzhour = int(tzstr[1:3])
tzminute = int(tzstr[3:5])
if tzstr[0] == '+':
return build_utcoffset(tzstr, datetime.timedelta(hours=tzhour, minutes=tzminute))
else:
if tzhour == 0 and tzminute == 0:
raise ValueError('String is not a valid ISO8601 time offset.')
else:
return build_utcoffset(tzstr, -datetime.timedelta(hours=tzhour, minutes=tzminute))
elif tzstrlen == 3:
#±hh
tzhour = int(tzstr[1:3])
if tzstr[0] == '+':
return build_utcoffset(tzstr, datetime.timedelta(hours=tzhour))
else:
if tzhour == 0:
raise ValueError('String is not a valid ISO8601 time offset.')
else:
return build_utcoffset(tzstr, -datetime.timedelta(hours=tzhour))
else:
raise ValueError('String is not a valid ISO8601 time offset.')
def build_utcoffset(name, utcdelta):
#We build an offset in this manner since the
#tzinfo class must have an init that can
#"method that can be called with no arguments"
returnoffset = UTCOffset()
returnoffset.setname(name)
returnoffset.setutcdelta(utcdelta)
return returnoffset
class UTCOffset(datetime.tzinfo):
def __repr__(self):
if self._utcdelta >= datetime.timedelta(hours=0):
return '+{0} UTC'.format(self._utcdelta)
else:
#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
correctedDays = abs(self._utcdelta.days + 1) #Negative deltas start at -1 day
deltaSeconds = (24 * 60 * 60) - self._utcdelta.seconds #Negative deltas have a positive seconds
days, remainder = divmod(deltaSeconds, 24 * 60 * 60) #(24 hours / day) * (60 minutes / hour) * (60 seconds / hour)
hours, remainder = divmod(remainder, 1 * 60 * 60) #(1 hour) * (60 minutes / hour) * (60 seconds / hour)
minutes, seconds = divmod(remainder, 1 * 60) #(1 minute) * (60 seconds / minute)
#Add any remaining days to the correctedDays count
correctedDays += days
if correctedDays == 0:
return '-{0}:{1:02}:{2:02} UTC'.format(hours, minutes, seconds)
else:
if correctedDays == 1:
return '-1 day, {0}:{1:02}:{2:02} UTC'.format(hours, minutes, seconds)
else:
return '-{0} days, {1}:{2:02}:{3:02} UTC'.format(correctedDays, hours, minutes, seconds)
def setname(self, name):
self._name = name
def setutcdelta(self, utcdelta):
self._utcdelta = utcdelta
def utcoffset(self, dt):
return self._utcdelta
def tzname(self, dt):
return self._name
def dst(self, dt):
#ISO8601 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)
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