time_methods.rb

module TimeMethods
  def self.define_time(sym, secs)
    module_eval <<-EOC, __FILE__, __LINE__
      def #{sym}; self * #{secs} end
      alias_method :#{sym}s, :#{sym}
    EOC
  end
  
  Numeric.send(:include, self)
  
  define_time :second, 1
  define_time :minute, 60.seconds
  define_time :hour,   60.minutes
  define_time :day,    24.hours
  define_time :week,   7.days
  define_time :year,   364.25.days
end