gistfile1.txt

require 'benchmark'
require 'time'

string = "2010-11-10 23:00:00 UTC"
n = 100_000

(ARGV[0] || 5).to_i.times do
  Benchmark.bm(20) do |b|
    b.report 'Time.parse' do
      n.times do
        Time.parse(string)
      end
    end

    b.report 'Time.strptime' do
      format = '%Y-%m-%d %H:%M:%S %z'
      n.times do
        Time.strptime(string, format)
      end
    end
  end
end