Add Dumai (Indonesia) 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 Dumai (Indonesia) is WIB, whose offset is GMT+7 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Dumai, Indonesia is "Asia/Jakarta"

It currently does not observe Daylight Savings Time.