since (ActiveSupport::CoreExtensions::Time::Calculations)

    # File lib/active_support/core_ext/time/calculations.rb, line 99
            def since(seconds)
              f = seconds.since(self)
              if ActiveSupport::Duration === seconds
                f
              else
                initial_dst = self.dst? ? 1 : 0
                final_dst   = f.dst? ? 1 : 0
                (seconds.abs >= 86400 && initial_dst != final_dst) ? f + (initial_dst - final_dst).hours : f
              end
            rescue
              self.to_datetime.since(seconds)
            end