Add UTC (Coordinated Universal 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 UTC (Coordinated Universal Time) is UTC, whose offset is GMT+0 from Greenwich Mean Time (GMT).

The IANA timezone identifier for UTC, Coordinated Universal Time is "UTC"

It currently does not observe Daylight Savings Time.