def atomize_ordinal(year, day, separator, sign)
      date = parse([year, day].join('-'))
      sign = "#{sign}1".to_i
      @separator = separator

      [sign * date.year, date.month, date.day]
    end
def atomize_ordinal(year, day, separator, sign)
      date = parse([year, day].join('-'))
      sign = "#{sign}1".to_i
      @separator = separator

      [sign * date.year, date.month, date.day]
    end
Parses an ordinal date (YYYY-DDD) and returns its atoms.

 @param [String] year in YYYY form.
 @param [String] day in DDD form.
 @param [String] separator the separator found in the input.
 @param [String] sign the sign found in the input.

 @return [Array<Integer>] date atoms.