how to invoke a method for every second in ruby

I wanted to create a stopwatch program in ruby so I googled it and found this SO Q.

But over there, the author calls the tick function with 1000xxx.times. I wanted to know how I can do it using something like (every second).times or for each increment of second do call the tick function.

Thread.new do
  while true do
    puts Time.now # or call tick function
    sleep 1
  end
end