I know this isn't any kind of surprise, and yet, well...
this post was submitted on 01 Dec 2023
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The only time using UTC breaks down is when any sort of time change gets involved.
If I say I want a reminder at 9am six months from now and you store that as UTC, a day light savings change will mean I get my reminder an hour early or late depending on where in the world I am
But wouldn't you calculate the time in the future in the right time zone and then store it back as UTC?
It depends on the application.
I don't remember all the specifics but this is the blog post I refer to when this topic comes up
https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a-silver-bullet/