CODEWITHSUNDEEP
pythonpython-3.xdatetime
phema
phema

Reputation: 69

Why does timedelta work differently when working with datetime

I have this function where it calculates today. I am wondering why is the following results are happening. 

today = datetime.datetime.now()

shows as 2018-06-13 17:13:42.372469

today = datetime.datetime.now().date()

shows as 2018-06-13

but when I try to use timedelta like this:

today = datetime.datetime.now().date() + datetime.timedelta(hours=-8)

it shows 2018-06-12. A full day back instead of 8 hours (should show 2018-06-13 9:13:42)

Can someone please explain why this happens and have timedelta correctly go back 8 hours instead of a day?

Upvotes: 0

Views: 96

Answers (1)

Tim Pietzcker
Tim Pietzcker

Reputation: 336078

By reducing the timestamp to the date only, you have effectively set the time to 00:00:00 - substracting 8 hours from 2018-06-13 midnight correctly results in 2018-06-12.

Why not use the correct timestamps for calculation, and only convert them to dates after you have performed them?

Upvotes: 3

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