Add Gualeguaychú (Argentina) 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 Gualeguaychú (Argentina) is America/Argentina/Cordoba, whose offset is GMT-3 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Gualeguaychú, Argentina is "America/Argentina/Cordoba"

It currently does not observe Daylight Savings Time.