Add Hagåtña (United States) 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 Hagåtña (United States) is ChST, whose offset is GMT+10 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Hagåtña, United States is "Pacific/Guam"

It currently does not observe Daylight Savings Time.