Add Nouadhibou (Mauritania) 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 Nouadhibou (Mauritania) is GMT, whose offset is GMT+0 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Nouadhibou, Mauritania is "Africa/Nouakchott"

It currently does not observe Daylight Savings Time.