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Python Dates and Times in Python (2014) Where on Earth do Timezones Make Sense? Introduction to Timezones

Posted by Ewerton Luna
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Ewerton Luna
Full Stack JavaScript Techdegree Graduate 24,031 Points

Not getting ValueError on "naive". What's different on newer versions of python?

>>> import datetime
>>> pacific = datetime.timezone(datetime.timedelta(hours=-8))
>>> eastern = datetime.timezone(datetime.timedelta(hours=-5))
>>> naive = datetime.datetime(2019, 1, 22, 9)
>>> naive
datetime.datetime(2019, 1, 22, 9, 0)
>>> aware = datetime.datetime(2019, 1, 22, 9, tzinfo=pacific)
>>> aware
datetime.datetime(2019, 1, 22, 9, 0, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=57600)))
>>> naive.astimezone(eastern)
datetime.datetime(2019, 1, 22, 7, 0, tzinfo=datetime.timezone(datetime.timedelta(days=-1, seconds=68400)))

Can someone explain me what's naive tzinfo argument set when I don't pass any argument to it?

I supposed that if I don't pass any tzinfo when creating a date time object, it will be set to the timezone to the location I'm at. But I would appreciate someone more knowledgeable if I'm correct and what are the differences between newer versions of python and the one Kenneth's using.

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

You are correct! The behavior of .astimezone() changed in Python 3.6:

"Changed in version 3.6: The astimezone() method can now be called on naive instances that are presumed to represent system local time."

gabrielalcaraz
gabrielalcaraz
7,694 Points

good I thought my computer was broken

Em Noble
Em Noble
6,918 Points

thanks!! i was confused on this also