IPeriodicSpecialDay Methods | 
| Name | Description | |
|---|---|---|
| Check(DateTime, Int32) | 
            Check whether a date matches this special day. A usage is returned
            if the date matches the specialday. See also optimized version below,
            to use when date.Months and date.Day is precalculated.
              | |
| Check(DateTime, Int32, Int32, Int32) | 
            Check whether a date matches this special day. A usage is returned
            if the date matches the specialday. Optimized version, when 
            the date.Month and date.Day is precalculated.
              |