Function uikit_sys::CFAbsoluteTimeGetDifferenceAsGregorianUnits

pub unsafe extern "C" fn CFAbsoluteTimeGetDifferenceAsGregorianUnits(
    at1: CFAbsoluteTime, 
    at2: CFAbsoluteTime, 
    tz: CFTimeZoneRef, 
    unitFlags: CFOptionFlags
) -> CFGregorianUnits