Information about standard time conventions associated with a specific geopolitical region.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Xcode 8.0+
Time defines the behavior of a time zone. Time zone values represent geopolitical regions. Consequently, these values have names for these regions. Time zone values also represent a temporal offset, either plus or minus, from Greenwich Mean Time (GMT) and an abbreviation (such as PST for Pacific Standard Time).
Time provides two static functions to get time zone values:
autoupdating time zone automatically tracks updates made by the user.
Note that time zone database entries such as “America/Los_Angeles” are IDs, not names. An example of a time zone name is “Pacific Daylight Time”. Although many
Time functions include the word “name”, they refer to IDs.
Cocoa does not provide any API to change the time zone of the computer, or of other applications.