Hey Stephen Wood

Time 2021-11-23 21:31:33

Web Name: Hey Stephen Wood

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Hey Stephen Wood

Explore nerdy things with me.

Tuesday, October 27, 2020 The curious case of Python's datetime -0753 UTC offset

"Time, the devourer of all things." - Ovid's Metamorphoses

Confused why your python datetime object's UTC offset is showing up as-0753instead of-0700(PDT) or-0800(PST)? I certainly was.

The tl;dr is because Python'spytzdoes not do the right thing with daylight saving's time when simply adding a timezone to a naive datetime object, and you must localize it.

Here's an example of what I was encountering. I was parsing a timestamp which was in theAmerica/Los_Angelestimezone. I needed to change the printed format, so I parsed the date and did a quick strftime and...-0753??

from datetime import datetimeimport pytztz = pytz.timezone("America/Los_Angeles")# Super duper sure this is America/Los_Angeles tzniave_string = "2020-10-05 14:03:40"dateobj = datetime.strptime(niave_string, "%Y-%m-%d %H:%M:%S")# Make it a timezone-aware object (Or so you think)dateobj = dateobj.replace(tzinfo=tz)# Notice the -0753 UTC offset...print(dateobj.strftime("%Y-%m-%d %H:%M:%S%z"))'2020-10-05 14:03:40-0753'

The mismatch happens because you can't just slap a tz onto a naive datetime object and hope it will do the right thing. More info on what's happening here can be found on this greatstack overflow answer.

The fix for this is tolocalizeyour date objects, not just replace the TZ:

from datetime import datetimeimport pytztz = pytz.timezone("America/Los_Angeles")# Super duper sure this is America/Los_Angeles tzniave_string = "2020-10-05 14:03:40"dateobj = datetime.strptime(niave_string, "%Y-%m-%d %H:%M:%S")# Localize your date object to your timezonedateobj = tz.localize(dateobj)# 

		   
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