Add Nukuʻalofa (Tonga) to your list and use my-locations table to visually convert it's time to another timezone or city time.
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Current time zone for Nukuʻalofa (Tonga) is Pacific/Tongatapu, whose offset is GMT+13 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Nukuʻalofa, Tonga is "Pacific/Tongatapu"

It currently does not observe Daylight Savings Time.