Add support to convert entity Datetime to ATOM when use in JSON encode

Author: nguereza-tony

src/Entity.php

@@ -46,6 +46,7 @@
 
 namespace Platine\Orm;
 
+use DateTime;
 use JsonSerializable;
 use Platine\Orm\Exception\PropertyNotFoundException;
 use Platine\Orm\Mapper\DataMapper;
@@ -128,7 +129,11 @@ public function jsonSerialize(): mixed
                     $data[$name] = $relation;
                 }
             } elseif ($this->mapper()->hasColumn($name)) {
-                $data[$name] = $this->mapper()->getColumn($name);
+                $value = $this->mapper()->getColumn($name);
+                if ($value instanceof DateTime) {
+                    $value = $value->format(DateTime::ATOM);
+                }
+                $data[$name] = $value;
             } else {
                 $data[$name] = $value;
             }

tests/EntityTest.php

@@ -4,6 +4,8 @@
 
 namespace Platine\Test\Orm;
 
+use DateTime;
+use DateTimeZone;
 use Platine\Dev\PlatineTestCase;
 use Platine\Orm\Entity;
 use Platine\Orm\EntityManager;
@@ -155,11 +157,15 @@ public function testJsonRealEntity(): void
         $er->name = 'foo';
 
         $e->foo = 'bar';
+        $e->date = new DateTime('2025-09-01', new DateTimeZone('Africa/Bangui'));
         $e->relation = $er;
 
-        $this->assertCount(2, $e->jsonSerialize());
+        $this->assertCount(3, $e->jsonSerialize());
         $this->assertArrayHasKey('foo', $e->jsonSerialize());
-        $this->assertEquals('{"foo":"bar","relation":{"name":"foo"}}', json_encode($e));
+        $this->assertEquals(
+            '{"foo":"bar","date":"2025-09-01T00:00:00+01:00","relation":{"name":"foo"}}',
+            json_encode($e)
+        );
     }
 
     public function testDataMapperInstance(): void