Returns the abbreviation for the time zone at a given date.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 8.0+
The date to use for the calculation. The default value is the current date.
Note that the abbreviation may be different at different dates. For example, during daylight saving time the US/Eastern time zone has an abbreviation of “EDT.” At other times, its abbreviation is “EST.”