[fergbrain]

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.

[moojd]

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

[ppog]

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

[sooper]

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

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

[pebers]

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