From: jc <james.cromwell@...>
Date: 2005-04-26T03:24:29+09:00
Subject: Re: Days in month

class Date
  def days_in_month
    ((Date.new(year, month, 1) >> 1)-1).day
  end
end

d = Date.new(2005,4,20) 
puts d.days_in_month #-> 30