The formatting style for units whose value is 0.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
When the value for a particular unit is 0, the zero formatting behavior determines whether that value is retained or omitted from any resulting strings. For example, when the formatting behavior is
drop, the value of one hour, ten minutes, and zero seconds would omit the mention of seconds.
The default value of this property is