    # File lib/fog/ibm/models/compute/server.rb, line 144
            def expire_at(time)
              expiry_time = (time.tv_sec * 1000).to_i
              data = service.modify_instance(id, 'expirationTime' => expiry_time)
              if data.body['expirationTime'] == expiry_time
                attributes[:expires_at] = expiry_time
                true
              else
                false
              end
            end