Add Johnston Islet (Falkland Islands) 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 Johnston Islet (Falkland Islands) is Atlantic/Stanley, whose offset is GMT-3 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Johnston Islet, Falkland Islands is "Atlantic/Stanley"

It currently does not observe Daylight Savings Time.