- Fixed GroupBy

src/Entity/Field/Date.php

@@ -4,11 +4,8 @@ namespace Ulmus\Entity\Field;
 
 class Date extends Datetime {
     
-    public function __toString()
-    {
-        return $this->format("Y-m-d");
-    }
-
+    public string $format = "Y-m-d";
+    
     public function formatLocale(string $format) : string
     {
         return strftime($format, $this->getTimestamp());