Public Sub SetGMonthDay(ByVal iMonth As Byte, ByVal iDay As Byte)
  Property Description  
    Argument iMonth sets the Month part of the date. Jan = 1, Feb = 2 etc. (Valid Range = 1 to 12)  
    Argument iDay sets the Day part of the date. (Valid Range = 1 to days in month)  
    Description Populates this DateTime as type gMonthDay  
    Remarks Throws: on parsing invalid values.
Throws: if this DateTimes current type is not either zeroYear or gMonthDay.