A notification posted whenever the system clock is changed.
- iOS 4.0+
- macOS 10.6+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
This can be initiated by a call to settimeofday(_:_:) or the user changing values in the Date and Time Preference panel.
The notification object is
null. This notification does not contain a