code: public static RubyRange<Date> range(Date start, Date end) {
      return new RubyRange<>(DateSuccessor.getInstance(), start, end,
          Interval.CLOSED);
    }
docs: Creates a {@link RubyRange} by given Dates.
  
  @param start
  of the range
  @param end
  of the range
  @return {@link RubyRange}