Add Tapachula (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 Tapachula (México) is CST, whose offset is GMT-6 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Tapachula, México is "America/Mexico_City"

It currently does not observe Daylight Savings Time.