CODEWITHSUNDEEP
pythondatetimepytz
Jill
Jill

Reputation: 63

How to check if date is in UTC format using pytz or datetime?

I'm using the pytz module to translate a date from America/Los_Angeles timezone to UTC using the code below:

TZ = 'America/Los_Angeles'
from = pytz.timezone(TZ)
utc = from.localize(original_date).astimezone(pytz.utc)

Now, I want to test if the UTC value is actually in UTC format or not. How to do that with pytz or datetime ?

Upvotes: 6

Views: 12328

Answers (5)

Nishith Baravkar
Nishith Baravkar

Reputation: 1

timezone.get_default_timezone()
time = timezone.make_aware(time, default_timezone)

The above code gets you the default timezone, which is mostly UTC. You can make the datetime timezone aware using the above code.

If using python 3.8 : time.tzinfo == pytz.utc

If using python 3.9 > : time.tzinfo == datetime.timezone.utc

Note : pytz.utc != datetime.timezone.utc so do check your the type of your date, using type(date).

Upvotes: 0

Bolke de Bruin
Bolke de Bruin

Reputation: 750

The accepted answer will not work for anything else other than pytz objects. As pytz is actually pretty bad at doing conversions [1] (e.g. properly doing daylight savings, etc.) it is probably better to do a cross-implementation check.

now = datetime.datetime.now(pytz.utc)
if now.tzinfo:
    now.utcoffset().total_seconds() == 0 # returns true

[1] https://pendulum.eustace.io/blog/a-faster-alternative-to-pyz.html

Upvotes: 11

Jay 3d
Jay 3d

Reputation: 21

Similar to a previous answer, you can do it like this:

If you have a given datetime object, you want to first convert it to a string with the strftime() method, then pass in the %Z specifier which gives the timezone name returning one of '(empty), UTC, GMT' according to the documentation.

so an example is:


def check_if_utc(my_datetime):
   return my_datetime.strftime('%Z') == 'UTC'

Upvotes: 0

theQuestionMan
theQuestionMan

Reputation: 1562

You can do it simply like this:

from datetime import datetime, timezone
lunch_time = datetime.now(timezone.utc)

if lunch_time.format('%Z') == 'UTC':
     print("Eat food")

This will also work with a naive time object because lunch_time.format('%Z') will return an empty string. This method will also work with pytz or any other module because you are simply checking the timezone as string not as an object (the accepted answer won't work with the above timezone module case, only pytz).

from datetime import datetime
import pytz
dinner_time = datetime.now(pytz.timezone('UTC'))

if dinner_time.format('%Z') == 'UTC':
     print("Hungry!")

Note: This will also eliminate the possibility of the timezone being GMT timezone rather than UTC timezone. The other answer now.utcoffset().total_seconds() == 0 will be True for GMT which may not be what you want.

The %Z specifier is documented here:
https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior

Upvotes: 1

eumiro
eumiro

Reputation: 212915

utc.tzinfo == pytz.utc # returns True if utc in UTC

Example:

now = datetime.datetime.now(pytz.utc)
now.tzinfo == pytz.utc # returns True

now = now.astimezone(pytz.timezone('America/Los_Angeles'))
now.tzinfo == pytz.utc # returns False

Upvotes: 7

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