Some useful datetime functions for Django
These utility functions are helpful in handling dates, datetimes, and timezones in Django.
Let's say you have the following in your Django settings.py
TIME_ZONE = 'EST' USE_TZ = True
Now let's attempt to write our own tomorrow() function.
from datetime import timedelta from django.utils.timezone import now def tomorrow(): # Subtle bug! Django's now() function returns a timezone enabled datetime # in UTC, regardless of the TIME_ZONE setting. If it's 11 Wednesday # MORNING in New York, this function will work. But if it's 11 Wednesday # NIGHT in New York, the UTC timezone is already in Thursday, so in that # case this code will return Friday. return now().date() + timedelta(days=1)
Here's one way to fix the problem.
from datetime import timedelta from djavedt import now def tomorrow(): # djavedt's now() function returns a timezone enabled datetime in the # timezone of the TIME_ZONE setting, which is EST in our example. So this # function will work as expected at 11PM in New York. return now().date() + timedelta(days=1)
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