Update datetime rule

Author: natanfelles

src/Validator.php

@@ -408,8 +408,10 @@ public static function datetime(
             return false;
         }
         $lastErrors = \DateTime::getLastErrors();
-        return $lastErrors
-            && $lastErrors['warning_count'] === 0
+        if ($lastErrors === false) {
+            return true;
+        }
+        return $lastErrors['warning_count'] === 0
             && $lastErrors['error_count'] === 0;
     }
 

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' => '2022-02-29 25:10:10',
+        ]));
     }
 
     public function testEquals() : void