CFGregorianUnitFlags
These option flags are used as a mask to indicate a specific set of fields in the CFGregorianDate or CFGregorianUnits structures.
Declaration
struct CFGregorianUnitFlagsOverview
These flags are used with functions such as CFGregorianDateIsValid(_:_:) and CFAbsoluteTimeGetDifferenceAsGregorianUnits(_:_:_:_:) which operate on a CFGregorianDate or CFGregorianUnits structure. For more details, see the discussion of those functions.