Add Zanzibar City (Tanzania) 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 Zanzibar City (Tanzania) is EAT, whose offset is GMT+3 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Zanzibar City, Tanzania is "Africa/Dar_es_Salaam"

It currently does not observe Daylight Savings Time.