diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index bedbd23532..5bc89dd520 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -948,7 +948,10 @@ phpbb.timezonePreselectSelect = function(forceSelector) {
 	var minutes = offset % 60;
 	var hours = (offset - minutes) / 60;
 
-	if (hours < 10) {
+	if (hours === 0) {
+		hours = '00';
+		sign = '+';
+	} else if (hours < 10) {
 		hours = '0' + hours.toString();
 	} else {
 		hours = hours.toString();