Add Edinburgh of the Seven Seas (Saint Helena, Ascension and Tristan da Cunha) 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 Edinburgh of the Seven Seas (Saint Helena, Ascension and Tristan da Cunha) is GMT, whose offset is GMT+0 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Edinburgh of the Seven Seas, Saint Helena, Ascension and Tristan da Cunha is "Atlantic/St_Helena"

It currently does not observe Daylight Savings Time.