updated update and create endpoint

src/main/java/com/ascendfinalproject/warehouse/services/WarehouseOrderService.java

@@ -7,6 +7,8 @@ import org.springframework.stereotype.Service;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
+import java.util.Date;
+
 @Service
 public class WarehouseOrderService {
 
@@ -23,15 +25,16 @@ public class WarehouseOrderService {
 
   public Mono<WarehouseOrder> createOrder(WarehouseOrder order) {
       order.setStatus("RECEIVED");
-
+      order.setCreatedAt(new Date(System.currentTimeMillis()));
       return orderRepository.save(order);
   }
 
   public Mono<WarehouseOrder> updateOrder(WarehouseOrder order, String id) {
-    return orderRepository.findById(id)
+        return orderRepository.findById(id)
             .flatMap(existingOrder -> {
               existingOrder.setOrderId(order.getOrderId());
               existingOrder.setStatus(order.getStatus());
+              existingOrder.setModifiedAt(new Date(System.currentTimeMillis()));
               return orderRepository.save(existingOrder);
             });