nantyara_calendar.rb

require 'open-uri'
require 'nokogiri'
require 'date'

CALENDAR_ID = 'mem79137'

today = Date.today

0.upto(5) do |n|
  month = today.next_month(n)
  id = "#{CALENDAR_ID}_date#{month.year}#{sprintf("%02d", month.month)}"

  open("https://freecalend.com/open/#{id}") do |f|
    Nokogiri::HTML::parse(f.read).tap do |doc|
      doc.css('.caldate').each do |node|
        unless node.content.empty?
          puts node[:id]
          puts node.content.gsub('<br>', "\n")
        end
      end
    end
  end
end