Add CHST (Chamorro Standard Time) 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 CHST (Chamorro Standard Time) is CHST, whose offset is GMT+10 from Greenwich Mean Time (GMT).

The IANA timezone identifier for CHST, Chamorro Standard Time is "CHST"

It currently does not observe Daylight Savings Time.