end_of_month

# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 233
        def end_of_month
          #self - ((self.mday-1).days + self.seconds_since_midnight)
          last_day = ::Time.days_in_month( self.month, self.year )
          change(:day => last_day, :hour => 23, :min => 59, :sec => 59, :usec => 999999.999)
        end