clear_rongyong_history.rb

(Date.parse('2015-10-01').to_date..Date.parse('2015-11-16').to_date).each do |date|
  1.upto(24).each do |i|
    hour = format("%02d", i)
    d = "#{date.to_s(:number)}#{hour}"
    result = c.message_history_delete(d)
    puts "#{date} #{result}"
  end
end