1 files changed, 4 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index 9834fde6..6343543e 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -113,6 +113,10 @@ function toSeconds(tm) {
     return Math.round(tm / 1000000);
 }
 
+function addSeconds(tm, n) {
+    return tm + n * 1000000;
+}
+
 
 // Error handling