code: def add_days(d, days_int):
          
          n = date(d.year, d.month, d.day) + timedelta(days_int)
          return BaseDateDatetimeDate(n.year, n.month, n.day)
docs: addition of a number of days
  
          :param BaseDateDatetimeDate d:
          :param int days_int:
          :return BaseDatetimeDate: