- Fixed Datetime output

src/Entity/Field/Datetime.php

@@ -6,6 +6,8 @@ use Ulmus\Entity\EntityObjectInterface;
 
 class Datetime extends \DateTime implements EntityObjectInterface {
 
+    public string $format = "Y-m-d H:i:s";
+
     public function load(...$arguments)
     {
         $value = $arguments[0];
@@ -20,12 +22,12 @@ class Datetime extends \DateTime implements EntityObjectInterface {
 
     public function save()
     {
-        return $this->getTimestamp();
+        return $this->__toString();
     }
 
     public function __toString()
     {
-        return $this->format("Y-m-d H:i:s");
+        return $this->format($this->format);
     }
 
 }