diff --git a/assets/js/localtime.js b/assets/js/localtime.js
index fb84e23..2ee6f31 100644
--- a/assets/js/localtime.js
+++ b/assets/js/localtime.js
@@ -31,7 +31,8 @@ function parseEventTimes() {
       const hour = parseInt(parts[0], 10);
       const minute = parseInt(parts[1], 10);
 
-      let date = Date.UTC(year, month, day, hour, minute);
+      // Date uses "monthIndex". Pretty bonkers!
+      let date = Date.UTC(year, month-1, day, hour, minute);
       date = new Date(date);
       date = dateformatter.format(date);
       eventtime.innerHTML += " (" + date + ")";