Fix date time interface

src/PropertyHandler/DateTimeExporter.php

@@ -76,6 +76,6 @@ public function importValue(Deserializer $deserializer, Field $field, mixed $sou
 
     public function canImport(Field $field, string $format): bool
     {
-        return in_array($field->phpType, [DateTimeInterface::class, DateTime::class, DateTimeImmutable::class], true);
+        return is_a($field->phpType, DateTimeInterface::class, allow_string: true);
     }
 }

tests/Records/DateTimeExtends.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Crell\Serde\Records;
+
+use DateTime;
+
+final class DateTimeExtends extends DateTime {}

tests/Records/DateTimeExtendsExample.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Crell\Serde\Records;
+
+final class DateTimeExtendsExample {
+  public function __construct(
+    public DateTimeExtends $extendsProperty,
+  ) {}
+}

tests/SerdeTestCases.php

@@ -26,6 +26,8 @@
 use Crell\Serde\Records\ClassWithReducibleProperty;
 use Crell\Serde\Records\CompoundTypes;
 use Crell\Serde\Records\DateTimeExample;
+use Crell\Serde\Records\DateTimeExtends;
+use Crell\Serde\Records\DateTimeExtendsExample;
 use Crell\Serde\Records\DateTimeInterfaceExample;
 use Crell\Serde\Records\DictionaryKeyTypes;
 use Crell\Serde\Records\Drupal\EmailItem;
@@ -345,6 +347,11 @@ public static function round_trip_examples(): iterable
                 interfaceProperty: new \DateTimeImmutable('2025-12-25 12:34:56.789'),
             ),
         ];
+        yield 'datetimeextends_type' => [
+            'data' => new DateTimeExtendsExample(
+                extendsProperty: new DateTimeExtends('2025-12-25 12:34:56.789'),
+            ),
+        ];
     }
 
     public static function value_object_flatten_examples(): \Generator