Fixed ArrayHelper::toArray for DateTime (#18880)

* Fixed ArrayHelper::toArray() for DateTime object

* Updated README.md for #18880 (Fixed ArrayHelper::toArray() for DateTime object)

Co-authored-by: Alexander Makarov <sam@rmcreative.ru>

framework/CHANGELOG.md

@@ -15,6 +15,7 @@ Yii Framework 2 Change Log
 - Bug #18845: Fix duplicating `id` in `MigrateController::addDefaultPrimaryKey()` (WinterSilence, samdark)
 - Bug #17119: Fix `yii\caching\Cache::multiSet()` to use `yii\caching\Cache::$defaultDuration` when no duration is passed (OscarBarrett)
 - Bug #18842: Fix `yii\base\Controller::bindInjectedParams()` to not throw error when argument of `ReflectionUnionType` type is passed (bizley)
+- Bug #18880: Fix `yii\helpers\ArrayHelper::toArray()` for `DateTime` objects in PHP >= 7.4 (rhertogh)
 
 
 2.0.43 August 09, 2021

framework/helpers/BaseArrayHelper.php

@@ -70,6 +70,8 @@ class BaseArrayHelper
             }
 
             return $object;
+        } elseif ($object instanceof \DateTimeInterface) {
+            return (array)$object;
         } elseif (is_object($object)) {
             if (!empty($properties)) {
                 $className = get_class($object);

tests/framework/helpers/ArrayHelperTest.php

@@ -114,6 +114,13 @@ class ArrayHelperTest extends TestCase
                 },
             ],
         ]));
+
+        // DateTime test
+        $this->assertEquals([
+            'date' => '2021-09-13 15:16:17.000000',
+            'timezone_type' => 3,
+            'timezone' => 'UTC',
+        ], ArrayHelper::toArray(new \DateTime('2021-09-13 15:16:17', new \DateTimeZone('UTC'))));
     }
 
     public function testRemove()