CODEWITHSUNDEEP
pythontimezonepytz
Mukund
Mukund

Reputation: 1105

convert given time from a given timezone to UTC

I have two inputs time 00:00 and timezone 'Asia/Kolkata'

I want to convert this to UTC time like '18.30'

I don't want to add or subtract offsets because it may affect the day light saving

what i did is

 local = pytz.timezone ("UTC")
 nativetime = datetime.strptime (setTime,frmt)
 local_dt = local.localize(nativetime, is_dst=None)
 utc_dt = local_dt.astimezone(pytz.utc)

but this doesn't change anything, the time is not converted to UTC

Please help

Upvotes: 0

Views: 2585

Answers (3)

Mukund
Mukund

Reputation: 1105

@thebjorn gave me the answer

here is what i did

def utc_to_local(utc_dt,local_tz):
    local_dt = utc_dt.replace(tzinfo=pytz.utc).astimezone(local_tz)
    return local_tz.normalize(local_dt)


setTime='00:00:00'
setZone='Asia/Kolkata'

datePart = str(datetime.utcnow()).split(' ')[0]
dateTimeUtcStr = datePart+' '+str(setTime)
tz = pytz.timezone('Asia/Kolkata')
tz_utc = pytz.timezone('UTC')
dateTimeRef = datetime.strptime(dateTimeUtcStr, '%Y-%m-%d %H:%M:%S')

#local to utc
tzUtc = pytz.timezone('UTC')
local_dt = tz.localize(dateTimeRef, is_dst=None)
utc_dt = local_dt.astimezone(pytz.utc)
print(utc_dt)

#utc to local
altTime = utc_to_local(utc_dt,tz)

print(altTime)

Upvotes: 0

FObersteiner
FObersteiner

Reputation: 25684

Since you say you're new to Python, it might be good to skip pytz since it's going to be deprecated with Python 3.9. You can use dateutil instead, which can be replaced more easily with zoneinfo in Python 3.9.

from datetime import datetime, timezone
from dateutil.tz import gettz

# assuming you have something like
dt_naive = datetime.strptime('2020-08-05', '%Y-%m-%d')

# dt_naive has no time zone info, so set it:
dt_aware = dt_naive.replace(tzinfo=gettz('Asia/Kolkata'))

# now you can convert to another timezone using .astimezone:
dt_aware_utc = dt_aware.astimezone(timezone.utc)

# datetime.datetime(2020, 8, 4, 18, 30, tzinfo=datetime.timezone.utc)
# -> 5:30 hours behind, which matches dt_aware.utcoffset()

Upvotes: 2

thebjorn
thebjorn

Reputation: 27360

Something like this, assuming you're on py3:

>>> import datetime
>>> import pytz
>>> tz = pytz.timezone('Asia/Kolkata')
>>> dt = datetime.datetime(2020, 8, 4, 0, 0, tzinfo=tz)
>>> dt.astimezone(pytz.utc)
datetime.datetime(2020, 8, 3, 18, 7, tzinfo=<UTC>)
>>>

Upvotes: 2

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