Add Hanoi (Vietnam) 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 Hanoi (Vietnam) is Asia/Bangkok, whose offset is GMT+7 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Hanoi, Vietnam is "Asia/Bangkok"

It currently does not observe Daylight Savings Time.