Add HMT (Heard and McDonald Islands 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 HMT (Heard and McDonald Islands Time) is HMT, whose offset is GMT-4 from Greenwich Mean Time (GMT).

The IANA timezone identifier for HMT, Heard and McDonald Islands Time is "HMT"