[Validator][ConstraintValidator] Safe fail on invalid timezones

Co-authored-by: Scott Dawson <scott@loyaltycorp.com.au>

Author: fancyweb

ConstraintValidator.php

@@ -87,16 +87,12 @@ protected function formatValue($value, $format = 0)
     {
         if (($format & self::PRETTY_DATE) && $value instanceof \DateTimeInterface) {
             if (class_exists('IntlDateFormatter')) {
-                $locale = \Locale::getDefault();
-                $formatter = new \IntlDateFormatter($locale, \IntlDateFormatter::MEDIUM, \IntlDateFormatter::SHORT, $value->getTimezone());
+                $formatter = new \IntlDateFormatter(\Locale::getDefault(), \IntlDateFormatter::MEDIUM, \IntlDateFormatter::SHORT, 'UTC');
 
-                // neither the native nor the stub IntlDateFormatter support
-                // DateTimeImmutable as of yet
-                if (!$value instanceof \DateTime) {
-                    $value = new \DateTime($value->format('Y-m-d H:i:s.u e'));
-                }
-
-                return $formatter->format($value);
+                return $formatter->format(new \DateTime(
+                    $value->format('Y-m-d H:i:s.u'),
+                    new \DateTimeZone('UTC')
+                ));
             }
 
             return $value->format('Y-m-d H:i:s');

Tests/ConstraintValidatorTest.php

@@ -27,6 +27,9 @@ public function testFormatValue($expected, $value, $format = 0)
 
     public function formatValueProvider()
     {
+        $defaultTimezone = date_default_timezone_get();
+        date_default_timezone_set('Europe/Moscow'); // GMT+3
+
         $data = [
             ['true', true],
             ['false', false],
@@ -36,10 +39,15 @@ public function formatValueProvider()
             ['array', []],
             ['object', $toString = new TestToStringObject()],
             ['ccc', $toString, ConstraintValidator::OBJECT_TO_STRING],
-            ['object', $dateTime = (new \DateTimeImmutable('@0'))->setTimezone(new \DateTimeZone('UTC'))],
-            [class_exists(\IntlDateFormatter::class) ? 'Jan 1, 1970, 12:00 AM' : '1970-01-01 00:00:00', $dateTime, ConstraintValidator::PRETTY_DATE],
+            ['object', $dateTime = new \DateTimeImmutable('1971-02-02T08:00:00UTC')],
+            [class_exists(\IntlDateFormatter::class) ? 'Oct 4, 2019, 11:02 AM' : '2019-10-04 11:02:03', new \DateTimeImmutable('2019-10-04T11:02:03+09:00'), ConstraintValidator::PRETTY_DATE],
+            [class_exists(\IntlDateFormatter::class) ? 'Feb 2, 1971, 8:00 AM' : '1971-02-02 08:00:00', $dateTime, ConstraintValidator::PRETTY_DATE],
+            [class_exists(\IntlDateFormatter::class) ? 'Jan 1, 1970, 6:00 AM' : '1970-01-01 06:00:00', new \DateTimeImmutable('1970-01-01T06:00:00Z'), ConstraintValidator::PRETTY_DATE],
+            [class_exists(\IntlDateFormatter::class) ? 'Jan 1, 1970, 3:00 PM' : '1970-01-01 15:00:00', (new \DateTimeImmutable('1970-01-01T23:00:00'))->setTimezone(new \DateTimeZone('America/New_York')), ConstraintValidator::PRETTY_DATE],
         ];
 
+        date_default_timezone_set($defaultTimezone);
+
         return $data;
     }
 }