omponent can be no more
      than 12.  The unsigned part of the minutes can be no more
      than 59.

   Calendars

      The calendar currently used by western countries is the
      Gregorian Calendar.  This calendar begins on Oct 15, 1582.
      Prior to Gregorian Calendar the Julian calendar was used
      The last Julian calendar date prior to the beginning
      of the Gregorian Calendar is Oct 5, 1582.

      The primary difference between the Julian and Gregorian
      calendars is in the determin