Add Saint-Louis (Réunion) 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 Saint-Louis (Réunion) is Indian/Reunion, whose offset is GMT+4 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Saint-Louis, Réunion is "Indian/Reunion"

It currently does not observe Daylight Savings Time.