Message 372396 - Python tracker

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Author	p-ganssle
Recipients	belopolsky, gpetty, p-ganssle
Date	2020-06-26.00:49:33
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1593132573.7.0.497625044736.issue41118@roundup.psfhosted.org>
In-reply-to

Content
There's a pretty clear warning on the documentation that utcfromtimestamp is unsuitable for this purpose: https://docs.python.org/3/library/datetime.html#datetime.datetime.utcfromtimestamp What you want is a datetime that knows what time zone it's in, so that it can be translated back into the absolute number of seconds since UTC. The correct way to do that is to tell the datetime it's in UTC by attaching the `datetime.timezone.utc` object (or any equivalent `tzinfo`). I have written a blog post explaining in detail why you should not use `utcnow` or `utcfromtimestamp`: https://blog.ganssle.io/articles/2019/11/utcnow.html Hopefully that is helpful to you.

There's a pretty clear warning on the documentation that utcfromtimestamp is unsuitable for this purpose: https://docs.python.org/3/library/datetime.html#datetime.datetime.utcfromtimestamp

What you want is a datetime that knows what time zone it's in, so that it can be translated back into the absolute number of seconds since UTC. The correct way to do that is to tell the datetime it's in UTC by attaching the `datetime.timezone.utc` object (or any equivalent `tzinfo`).

I have written a blog post explaining in detail why you should not use `utcnow` or `utcfromtimestamp`: https://blog.ganssle.io/articles/2019/11/utcnow.html

Hopefully that is helpful to you.

History
Date	User	Action	Args
2020-06-26 00:49:33	p-ganssle	set	recipients: + p-ganssle, belopolsky, gpetty
2020-06-26 00:49:33	p-ganssle	set	messageid: <1593132573.7.0.497625044736.issue41118@roundup.psfhosted.org>
2020-06-26 00:49:33	p-ganssle	link	issue41118 messages
2020-06-26 00:49:33	p-ganssle	create