# File lib/active_support/core_ext/time/calculations.rb, line 149
        def end_of_month
          #self - ((self.mday-1).days + self.seconds_since_midnight)
          last_day = ::Time.days_in_month( self.month, self.year )
          change(:mday => last_day,:hour => 0, :min => 0, :sec => 0, :usec => 0)
        end