code: def IsActiveOn(self, date, date_object=None):
      
      if date in self.date_exceptions:
        exception_type, _ = self.date_exceptions[date]
        if exception_type == self._EXCEPTION_TYPE_ADD:
          return True
        else:
          return False
      if (self.start_date and self.end_date and self.start_date <= date and
          date <= self.end_date):
        if date_object is None:
          date_object = util.DateStringToDateObject(date)
        return self.day_of_week[date_object.weekday()]
      return False
docs: Test if this service period is active on a date.
  
      Args:
        date: a string of form "YYYYMMDD"
        date_object: a date object representing the same date as date.
                     This parameter is optional, and present only for performance
                     reasons.
                     If the caller constructs the date string from a date object
                     that date object can be passed directly, thus avoiding the
                     costly conversion from string to date object.
  
      Returns:
        True iff this service is active on date.