Add Cancún (México) 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 Cancún (México) is EST, whose offset is GMT-5 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Cancún, México is "America/Cancun"

It currently does not observe Daylight Savings Time.