Get timezone abbreviation from UTC offset

Question

I have the UTC offset in my DB for the users:

+5:30 

How can I get the timezone abbreviation from this UTC offset using Python?

Suc

Answer 1

You can get a set (zero or more) of timezone abbreviations (as specified in the tz database) that corresponds to the given UTC offset now:

#!/usr/bin/env python
from datetime import datetime, timedelta
import pytz # $ pip install pytz

utc_offset = timedelta(hours=5, minutes=30) # +5:30
now = datetime.now(pytz.utc) # current time
print({now.astimezone(tz).tzname() 
       for tz in map(pytz.timezone, pytz.all_timezones_set)
       if now.astimezone(tz).utcoffset() == utc_offset})

Output

set(['IST'])

If you want to get abbreviations including the historical data:

#!/usr/bin/env python
from datetime import datetime, timedelta
import pytz # $ pip install pytz

utc_offset = timedelta(hours=5, minutes=30) # +5:30
abbr = set()
now = datetime.now(pytz.utc)
for tz in map(pytz.timezone, pytz.all_timezones_set):
    dt = now.astimezone(tz)    
    tzinfos = getattr(tz, '_tzinfos',
                      [(dt.utcoffset(), dt.dst(), dt.tzname())])
    abbr.update(tzname for off, _, tzname in tzinfos if off == utc_offset)
print(abbr)

Output

set(['IST'])