Update datetime rule

Author: natanfelles

src/Validator.php

@@ -403,8 +403,11 @@ public static function datetime(
         if ($data === null) {
             return false;
         }
-        $data = \DateTime::createFromFormat($format, $data);
-        if ($data === false) {
+        $datetime = \DateTime::createFromFormat($format, $data);
+        if ($datetime === false) {
+            return false;
+        }
+        if ($datetime->format($format) !== $data) {
             return false;
         }
         $lastErrors = \DateTime::getLastErrors();

tests/ValidatorTest.php

@@ -176,6 +176,9 @@ public function testDatetime() : void
         self::assertTrue(Validator::datetime('year', $this->array, 'Y'));
         self::assertFalse(Validator::datetime('alpha', $this->array));
         self::assertFalse(Validator::datetime('unknown', $this->array));
+        self::assertFalse(Validator::datetime('foo', [
+            'foo' => '023-01-10',
+        ], 'Y-m-d'));
     }
 
     public function testEquals() : void