Fix bug which I know I fixed before (perhaps on another branch?) to

ensure old time had a value before comparing it to new time.

cms/static/js/views/settings/main_settings_view.js

@@ -227,7 +227,7 @@ CMS.Views.Settings.Details = CMS.Views.ValidatingView.extend({
                     time = 0;
                 }
                 var newVal = new Date(date.getTime() + time * 1000);
-                if (cacheModel.get(fieldName).getTime() !== newVal.getTime()) {
+                if (!cacheModel.has(fieldName) || cacheModel.get(fieldName).getTime() !== newVal.getTime()) {
                     cacheModel.save(fieldName, newVal, { error: CMS.ServerError});
                 }
             }