How to write "First of every month in Ruby" -

I am trying to write an iterator in Ruby which sends the first callback of each month.

How would you write something like this?

  if date.today.day == 1 #do something end  < / Pre> 
 I'm not sure what you are saying to an Iterator - I hope that it does not mean that a program looping, constantly asks if today's day is the first month? Crontab seems like a waste of resources :)