'''
Timezones are defined per RFC822 5.1 (plus GMT and UTC),
with values representing offsets from UTC in milliseconds.
'''
import types
import synapse.exc as s_exc
_onehour = 3600000
_timezones = types.MappingProxyType({
'A': -1 * _onehour,
'CDT': -5 * _onehour,
'CST': -6 * _onehour,
'EDT': -4 * _onehour,
'EST': -5 * _onehour,
'GMT': 0,
'M': -12 * _onehour,
'MDT': -6 * _onehour,
'MST': -7 * _onehour,
'N': 1 * _onehour,
'PDT': -7 * _onehour,
'PST': -8 * _onehour,
'UT': 0,
'UTC': 0,
'Y': 12 * _onehour,
'Z': 0,
})
[docs]def getTzNames():
'''
Return a tuple of all supported timezone names.
'''
return tuple(_timezones.keys())
[docs]def getTzOffset(name, defval=None):
'''
Return tuple of the UTC offset in milliseconds and an info dict.
'''
try:
return _timezones.get(name.upper(), defval), {}
except AttributeError:
raise s_exc.BadArg(mesg=f'Timezone name must a string') from None