Add Aishalton (Guyana) to your list and use my-locations table to visually convert it's time to another timezone or city time.
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Current time zone for Aishalton (Guyana) is America/Guyana, whose offset is GMT-4 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Aishalton, Guyana is "America/Guyana"

It currently does not observe Daylight Savings Time.