Merge branch 'hotfix/2633'

Close zendframework/zendframework#2633

src/Date.php

@@ -128,7 +128,7 @@ public function isValid($value)
             // and still return a DateTime object
             $errors = DateTime::getLastErrors();
 
-            if (false === $date || $errors['warning_count'] > 0) {
+            if ($errors['warning_count'] > 0) {
                 $this->error(self::INVALID_DATE);
                 return false;
             }