more optimization!

datecheckerbench.rb

Benchmark.ips do |x|
  strings = ['android', '1002,60009,30012,60004,20023,10005,10011,50003,10012,50004,10005,30013,60007,10006', '4068B063-0CDF-4579-B4E9-15298ECF9929', 'android', '1002,60009,30012,60004,20023,10005,10011,50003,10012,50004,10005,30013,60007,10006', '4068B063-0CDF-4579-B4E9-15298ECF9929', 'android', '1002,60009,30012,60004,20023,10005,10011,50003,10012,50004,10005,30013,60007,10006', '4068B063-0CDF-4579-B4E9-15298ECF9929']
  times = ['2016-08-01 13:00:01+0000', '2016-08-01T13:00:01+0000', '2015-09-27T16:36:45.966+0000']
  10.times do
    times += strings
  end
  pt = times.map { |t| Time.parse(t) rescue nil }

  x.report("match then build w/ iso") do
    times.each_with_index do |time, i|
      m = time.match(/^(\d+-\d+-\d+)[T ](\d+:\d+:\d+[.0-9]*)/)
      next unless m
      t = Time.iso8601("#{m[1]}T#{m[2]}+00:00")
      raise unless pt[i] == t
    end
  end
  x.report("match then build w/ new") do
    times.each_with_index do |time, i|
      m = time.match(/^(\d{4})-(\d{2})-(\d{2})[T ](\d{2}):(\d{2}):(\d{2}(?:\.\d+)?)/)
      next unless m
      t = Time.new(*m[1..5], m[6].to_r, 0)
      raise unless pt[i] == t
    end
  end
  x.report("match then build w/ new + early skip") do
    times.each_with_index do |time, i|
      next unless time[4] == '-' && (year = time[0..3].to_i) && year > 2000
      m = time.match(/^(\d{4})-(\d{2})-(\d{2})[T ](\d{2}):(\d{2}):(\d{2}(?:\.\d+)?)/)
      t = Time.new(*m[1..5], m[6].to_r, 0)
      raise unless pt[i] == t
    end
  end
  x.compare!
end