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Try'n'Go: The Last Date (See related posts)

Extends Date class with a method that return the last Date of a month.
Date#last_of_month takes either a Fixnum or a Time as argument.

   1  
   2  require 'date'
   3  
   4  class Date
   5    def self.last_of_month( arg = Time.now )
   6      year = ( arg.is_a? Fixnum ) ? Time.now.year : arg.year
   7      mon  = ( arg.is_a? Fixnum ) ? arg : ( arg.mon rescue Time.now.mon )
   8      
   9      raise ArgumentError unless mon.between?( 1, 12 )
  10  
  11      begin; Date.new year, mon, mday ||= 31
  12      rescue ArgumentError; mday -= 1; retry
  13      end
  14    end
  15  end
to ruby date by boof on Thu Feb 22 07:11:56 -0500 2007

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