Add Centurion (South Africa) 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 Centurion (South Africa) is SAST, whose offset is GMT+2 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Centurion, South Africa is "Africa/Johannesburg"

It currently does not observe Daylight Savings Time.