ToggleDate
ToggleResults ToggleDate (lSecs, field, delta, ch, params ); LongDateTime *lSecs ;
LongDateField field ;
DateDelta delta ;
short ch ;
The ToggleDate function modifies a LongDateTime parameter by toggling one of the corresponding fields of the long date record up or down or by setting it
explicitly.For more information see, Macintosh Worldwide Development: Guide
to System Software