If you no longer need a time zone, you can delete it.
Choose View > Cities & Time Zones.
Select one or more time zones in the list.
To select time zones that are next to each other (contiguous) in the list, press the Shift key and then click the first and last time zone; to select time zones that are not next to each other in the list, press the Command key and then click each time zone.
Click the Remove (-) button at the bottom of the list or press the Delete key. Coordinated Universal Time, Internet Time, and time zones that are associated to clocks can't be deleted.
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