Current File : //lib/calibre/calibre/utils/iso8601.py
#!/usr/bin/env python3
# License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
from datetime import datetime
from dateutil.tz import tzlocal, tzutc, tzoffset
from calibre_extensions import speedup
class SafeLocalTimeZone(tzlocal):
def _isdst(self, dt):
# This method in tzlocal raises ValueError if dt is out of range (in
# older versions of dateutil)
# In such cases, just assume that dt is not DST.
try:
return super()._isdst(dt)
except Exception:
pass
return False
def _naive_is_dst(self, dt):
# This method in tzlocal raises ValueError if dt is out of range (in
# newer versions of dateutil)
# In such cases, just assume that dt is not DST.
try:
return super()._naive_is_dst(dt)
except Exception:
pass
return False
utc_tz = tzutc()
local_tz = SafeLocalTimeZone()
del tzutc, tzlocal
UNDEFINED_DATE = datetime(101,1,1, tzinfo=utc_tz)
def parse_iso8601(date_string, assume_utc=False, as_utc=True, require_aware=False):
if not date_string:
return UNDEFINED_DATE
dt, aware, tzseconds = speedup.parse_iso8601(date_string)
tz = utc_tz if assume_utc else local_tz
if aware: # timezone was specified
if tzseconds == 0:
tz = utc_tz
else:
sign = '-' if tzseconds < 0 else '+'
description = "%s%02d:%02d" % (sign, abs(tzseconds) // 3600, (abs(tzseconds) % 3600) // 60)
tz = tzoffset(description, tzseconds)
elif require_aware:
raise ValueError(f'{date_string} does not specify a time zone')
dt = dt.replace(tzinfo=tz)
if as_utc and tz is utc_tz:
return dt
return dt.astimezone(utc_tz if as_utc else local_tz)
if __name__ == '__main__':
import sys
print(parse_iso8601(sys.argv[-1]))
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