cmd = "puts Time.local(2009).zone"

zones = ['America/New_York5:00:00', 'Asia/Kuwait']
zones.each do |tz|
  ENV['TZ'] = tz
  puts `ruby -e \"#{cmd}\"` # Prints two different values on Windows
end

zones.each do |tz|
  ENV['TZ'] = tz
  eval(cmd) # Prints the same value on Windows since changing ENV[‘TZ’] on the fly does not work
end