Add GMT+13 (Greenwich Mean Time) to your list and use my-locations table to visually convert it's time to another timezone or city time.
Mouse over the colored hour-tiles and glance at the hours selected by the column.

Current time zone for GMT+13 (Greenwich Mean Time) is GMT+13, whose offset is GMT+13 from Greenwich Mean Time (GMT).

The IANA timezone identifier for GMT+13, Greenwich Mean Time is "GMT+13"

It currently does not observe Daylight Savings Time.