Using pytz
, I know how to get a listing a Timezone names, but I would like to get all possible Timezone abbreviations for each Timezone name:
import pytz
list(pytz.common_timezones)
['Africa/Abidjan', 'Africa/Accra', 'Africa/Addis_Ababa',...]
What I am looking for is given any Timezone abbreviation, example PST or PDT, ignoring current datetime (e.g. now), return the all possible Timezone name, in this case a list that would include America/Los_Angeles.
Thanks
Format UTC DateTime to Get the timezone name Extract the timezone name from UTC DateTime using the DateTime formatting in Python. Use the %Z directive to get the timezone name.
You can also use the pytz module to create timezone-aware objects. For this, we will store the current date and time in a new variable using the datetime. now() function of datetime module and then we will add the timezone using timezone function of pytz module.
The zoneinfo module provides a concrete time zone implementation to support the IANA time zone database as originally specified in PEP 615.
The pytz package encourages using UTC for internal timezone representation by including a special UTC implementation based on the standard Python reference implementation in the Python documentation. The UTC timezone unpickles to be the same instance, and pickles to a smaller size than other pytz tzinfo instances.
Since you wish to ignore the current datetime, it sounds like you want to find
any timezone which ever used the given abbreviation at any time in the
past. That information is in the Olson database and accessible through
pytz. However, pytz stores this information in the private attribute,
tzone._transition_info
:
import collections
import datetime as DT
import pytz
tzones = collections.defaultdict(set)
abbrevs = collections.defaultdict(set)
for name in pytz.all_timezones:
tzone = pytz.timezone(name)
for utcoffset, dstoffset, tzabbrev in getattr(
tzone, '_transition_info', [[None, None, DT.datetime.now(tzone).tzname()]]):
tzones[tzabbrev].add(name)
abbrevs[name].add(tzabbrev)
The reason for the third (default) argument to gettattr
is to handle a few
timezones, such as Africa/Bujumbura
, which never had any transitions. So the
abbreviation in these cases is the current abbreviation.
In [94]: tzones['PST']
Out[94]:
{'America/Bahia_Banderas',
'America/Boise',
'America/Creston',
'America/Dawson',
'America/Dawson_Creek',
'America/Ensenada',
'America/Hermosillo',
'America/Inuvik',
'America/Juneau',
'America/Los_Angeles',
'America/Mazatlan',
'America/Metlakatla',
'America/Santa_Isabel',
'America/Sitka',
'America/Tijuana',
'America/Vancouver',
'America/Whitehorse',
'Canada/Pacific',
'Canada/Yukon',
'Mexico/BajaNorte',
'Mexico/BajaSur',
'PST8PDT',
'Pacific/Pitcairn',
'US/Pacific',
'US/Pacific-New'}
In [95]: tzones['PDT']
Out[95]:
{'America/Boise',
'America/Dawson',
'America/Dawson_Creek',
'America/Ensenada',
'America/Juneau',
'America/Los_Angeles',
'America/Metlakatla',
'America/Santa_Isabel',
'America/Sitka',
'America/Tijuana',
'America/Vancouver',
'America/Whitehorse',
'Canada/Pacific',
'Canada/Yukon',
'Mexico/BajaNorte',
'PST8PDT',
'US/Pacific',
'US/Pacific-New'}
In [97]: abbrevs['America/Los_Angeles']
Out[97]: {'LMT', 'PDT', 'PPT', 'PST', 'PWT'}
As Paul points out, note that timezone abbreviations are ambiguous -- they do not necessarily map to timezones with the same utcoffset. For example, both Asia/Shanghai
and US/Central
use the CST
timezone abbreviation.
In [242]: 'Asia/Shanghai' in tzones['CST']
Out[242]: True
In [243]: 'US/Central' in tzones['CST']
Out[243]: True
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