diff --git date_api.module date_api.module
index 8639596..3292143 100644
--- date_api.module
+++ date_api.module
@@ -581,10 +581,14 @@ class DateObject extends DateTime {
   public function arrayErrors($arr) {
     $errors = array();
     $now = date_now();
+
+    $default_month = !empty($arr['month']) ? $arr['month'] : $now->format('n');
+    $default_year = !empty($arr['year']) ? $arr['year'] : $now->format('Y');
+
     foreach ($arr as $part => $value) {
       // Avoid false errors when a numeric value is input as a string by forcing it numeric.
       $value = intval($value);
-      if (!empty($value) && $this->forceValid($part, $value, 'now', $now->format('n'), $now->format('Y')) != $value) {
+      if (!empty($value) && $this->forceValid($part, $value, 'now', $default_month, $default_year) != $value) {
         // Use a switchcase to make translation easier by providing a different message for each part.
         switch($part) {
           case 'year':