A unit of measure for duration of time.
- iOS 10.0+
- macOS 10.12+
- Mac Catalyst 13.0+Beta
- tvOS 10.0+
- watchOS 3.0+
You typically use instances of
NSUnit to represent specific quantities of planar angle using the
Duration is a quantity of time. The SI unit for time is the second (sec), which is defined in terms of the radioactivity of a cesium-133 atom. Duration is also commonly expressed in terms of minutes (min) and hours (hr).