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Without loss requires the version of the timezones data too.

"it was 2:01am on November 5th, in America/Los_Angeles and the offset was -7 (retrieved from ICU v97)"

I can't take credit for this idea - it's from Jon Skeet: https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a...

Interesting point. I don't think I have that particular use case, but I can definitely imagine it. I'd think especially with dates in the far future and the timezone offsets are altered between the time of recording and the time value itself?

Individual timezones are pretty stable but a handful change every year in some way, often switching how they observe DST or something similar. If you have a truly global userbase and this actually matters, you'll definitely hit them.

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