compare_tz_env_var.rb

require "benchmark/ips"

Benchmark.ips do |x|
  x.report("without TZ") do |n|
    ENV["TZ"] = nil

    i = 0
    while i < n
      Time.now
      i += 1
    end
  end

  x.report("with TZ") do |n|    
    ENV["TZ"] = ":/etc/localtime"

    i = 0
    while i < n
      Time.now
      i += 1
    end
  end

  x.compare!
end