Python convert raw GMT to othertime zone e.g SGT

Question

I am trying to convert from GMT to e.g SGT:

For example, the value

0348 GMT should be 11:48 am 1059 GMT should be 6:59 pm

how do i do this?

i have tried:

date="03:48"
curr = (
    dt.datetime.strptime(date, "%H:%M")

    .astimezone(timezone('Asia/Singapore'))
)
print(curr)

But I am getting OSError: [Errno 22] Invalid argument

ref: https://stackoverflow.com/questions/10997577/python-timezone-conversion — Ameya Rane, Jul 28 '20 at 05:29
Did you try anything? Have a look at e.g. `dateutil` to get a time zone? For SGT, you'll have to use the name 'Asia/Singapore'. — FObersteiner, Jul 28 '20 at 05:33
@AmeyaRane: `pytz` is [to be deprecated](https://pypi.org/project/pytz-deprecation-shim/), use `dateutil` instead, or `zoneinfo` with Python 3.9. — FObersteiner, Jul 28 '20 at 06:02
your example is missing a date, it's just a time! without a date, timezone information is ambiguous due to DST (except GMT/UTC) — FObersteiner, Jul 28 '20 at 06:03

score 0 · Answer 1 · answered Jul 28 '20 at 06:11

Assuming you have a naive datetime object which represents UTC:

from datetime import datetime, timezone
from dateutil import tz

now = datetime.now()
print(repr(now))
>>> datetime.datetime(2020, 7, 28, 8, 5, 42, 553781)

Make sure to set the tzinfo property to UTC using replace:

now_utc_aware = now.replace(tzinfo=timezone.utc)
print(repr(now_utc_aware))
>>> datetime.datetime(2020, 7, 28, 8, 5, 42, 553781, tzinfo=datetime.timezone.utc)

Now you can convert to another timezone using astimezone:

now_sgt = now_utc_aware.astimezone(tz.gettz('Asia/Singapore'))
print(repr(now_sgt))
>>> datetime.datetime(2020, 7, 28, 16, 5, 42, 553781, tzinfo=tzfile('Singapore'))

Sidenote, referring to your other question, if you parse correctly, you already get an aware datetime object:

date = "2020-07-27T16:38:20Z"
dtobj = datetime.fromisoformat(date.replace('Z', '+00:00'))
print(repr(dtobj))
>>> datetime.datetime(2020, 7, 27, 16, 38, 20, tzinfo=datetime.timezone.utc)

Python convert raw GMT to othertime zone e.g SGT

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