my_tweet.rb

# gem install twitter
require 'twitter'

# https://apps.twitter.com/
client = Twitter::REST::Client.new do |config|
  config.consumer_key    = "...."
  config.consumer_secret = "...."
end

def collect_with_max_id(collection=[], max_id=nil, &block)
  response = yield(max_id)
  collection += response
  response.empty? ? collection.flatten : collect_with_max_id(collection, response.last.id - 1, &block)
end

def client.get_all_tweets(user)
  collect_with_max_id do |max_id|
    options = {count: 200, include_rts: true}
    options[:max_id] = max_id unless max_id.nil?
    user_timeline(user, options)
  end
end

all_tweets = client.get_all_tweets("ihower")

stop_at = "2017-09"

File.open("tweets.md", 'w') do |f|
  current_ym = "#{all_tweets[0].created_at.year}-#{all_tweets[0].created_at.month}"

  f << "<h2>#{all_tweets[0].created_at.year}/#{all_tweets[0].created_at.month}</h2>\n"
  f << "<ul>\n"
  all_tweets.each do |tweet|
    this_ym = "#{tweet.created_at.year}-#{tweet.created_at.month}"

    if this_ym == stop_at
      break
    end

    if current_ym != this_ym
      f << "</ul>\n"
      f << "<h2>#{tweet.created_at.year}/#{tweet.created_at.month}</h2>\n"
      f << "<ul>\n"
    end
    current_ym = this_ym

    f << "<li><a href=\"#{tweet.url}\">#{tweet.created_at.getlocal.to_s[0,16]}</a> #{tweet.full_text}</li>\n"
  end
  f << "</ul>\n"
end