Add CST (Central Standard Time (North America)) 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 CST (Central Standard Time (North America)) is CST, whose offset is GMT-5 from Greenwich Mean Time (GMT).

The IANA timezone identifier for CST, Central Standard Time (North America) is "CST"