These option flags are used as a mask to indicate a specific set of fields in the CFGregorianDate or CFGregorianUnits structures.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
These flags are used with functions such as
CFAbsolute which operate on a CFGregorianDate or CFGregorianUnits structure. For more details, see the discussion of those functions.