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Comment by rwmj | Hacker News Reader

Or any country, since timezones only have a 1 hour granularity. If you're in Edinburgh (same longitude as Plymouth) this is quite noticable. Be interesting to see the consequences of hyper-local timezones where the sun is always over your head at 12 noon. With modern computing it should be possible to have your watch adjust as you drive east-west ...

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Time zones can have any granularity desired. Most are 1 hour, several are 30 minutes (including in India and Australia), and a few are 45 minutes (in New Zealand, for example). There’s no rule though about granularity though.

From my experience working with date/time I don't think there are any rules at all.

New Zealand's timezones are full hours, not 45 minutes. You might be thinking of Nepal? (Picky - your broader point is of course right.)

Nope, OP is correct - the Chatham Islands are GMT + 12 hours 45 minutes.

I think the poster is refering to Chatham Islands timezone[1].

[1] https://www.timeanddate.com/time/zone/new-zealand/chatham-is...

There are actually a few 30 minute and I think even 15 minute timezones.

And then we need to track lat/longs for every timestamp!

"Says here you arrived at 1.33pm! You were meant to be there at 1.30pm!" "But Sir, look, it was 57 miles east so I was early!"

Most countries agree to use a 1-hour division, but not all. Iran's offset, for example, is +3:30.

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