code: def omer_day(self):
          
          first_omer_day = HebrewDate(self.hdate.year, Months.Nisan, 16)
          omer_day = self._jdn - conv.hdate_to_jdn(first_omer_day) + 1
          if not 0 < omer_day < 50:
              return 0
          return omer_day
docs: Return the day of the Omer.