[12.x] Fix date_format validation on DST Timezone

crynobone · crynobone · commit 62ed4345352e · 2025-08-26T23:08:19.000+08:00
fix #56760 Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>
diff --git a/src/Illuminate/Validation/Concerns/ValidatesAttributes.php b/src/Illuminate/Validation/Concerns/ValidatesAttributes.php
@@ -625,7 +625,7 @@ public function validateDateFormat($attribute, $value, $parameters)
 
         foreach ($parameters as $format) {
             try {
-                $date = DateTime::createFromFormat('!'.$format, $value);
+                $date = DateTime::createFromFormat('!'.$format, $value, new DateTimeZone('UTC'));
 
                 if ($date && $date->format($format) == $value) {
                     return true;
diff --git a/tests/Integration/Validation/Rules/DateFormatValidationTest.php b/tests/Integration/Validation/Rules/DateFormatValidationTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Illuminate\Tests\Integration\Validation\Rules;
+
+use Illuminate\Support\Facades\Validator;
+use Orchestra\Testbench\TestCase;
+use PHPUnit\Framework\Attributes\TestWith;
+
+class DateFormatValidationTest extends TestCase
+{
+    #[TestWith(['UTC'])]
+    #[TestWith(['Europe/Amsterdam'])]
+    public function test_it_can_validate_regardless_of_timezone(string $timezone)
+    {
+        date_default_timezone_set($timezone);
+
+        $payload = ['date' => '2025-03-30 02:00:00'];
+        $rules = ['date' => 'date_format:Y-m-d H:i:s'];
+
+        $validator = Validator::make($payload, $rules);
+
+        $this->assertTrue($validator->passes());
+        $this->assertEmpty($validator->errors()->all());
+    }
+}
