diff --git a/library/Icinga/Util/TimezoneDetect.php b/library/Icinga/Util/TimezoneDetect.php
index dfd8d550d..f5e033ae0 100644
--- a/library/Icinga/Util/TimezoneDetect.php
+++ b/library/Icinga/Util/TimezoneDetect.php
@@ -53,7 +53,7 @@ class TimezoneDetect
         }
 
         if (Platform::isCli() === false && array_key_exists(self::$cookieName, $_COOKIE)) {
-            list($offset, $dst) = explode(',', $_COOKIE[self::$cookieName]);
+            list($offset, $dst) = explode('-', $_COOKIE[self::$cookieName]);
             $timezoneName = timezone_name_from_abbr('', (int)$offset, (int)$dst);
 
             self::$success = (bool)$timezoneName;
diff --git a/public/js/icinga/timezone.js b/public/js/icinga/timezone.js
index 1395671a5..c018c5db1 100644
--- a/public/js/icinga/timezone.js
+++ b/public/js/icinga/timezone.js
@@ -73,7 +73,7 @@
                 return;
             }
 
-            this.writeCookie(this.cookieName, timezoneOffset + ',' + Number(dst), 1);
+            this.writeCookie(this.cookieName, timezoneOffset + '-' + Number(dst), 1);
         },
 
         /**