1 files changed, 4 insertions, 0 deletions
diff --git a/www/js/clock.js b/www/js/clock.js
index 59f53de..a2b0628 100644
--- a/www/js/clock.js
+++ b/www/js/clock.js
@@ -43,6 +43,10 @@ function Clock() {
     this.draw_callbacks.fireWith(window, [date_str, time_str, get_rd_week(rdtime_ms)]);
   }
 
+  this.addCallback = function(cb) {
+    this.draw_callbacks.add(cb);
+  }
+
   this.ntp_update = function(event) {
     var t4 = (+new Date());