Add Ciudad de la Costa (Uruguay) 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 Ciudad de la Costa (Uruguay) is America/Montevideo, whose offset is GMT-3 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Ciudad de la Costa, Uruguay is "America/Montevideo"

It currently does not observe Daylight Savings Time.