1 files changed, 8 insertions, 0 deletions
diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index b557147b..a5ab90c5 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -132,10 +132,18 @@ function diffInSeconds(tm1, tm2) {
     return Math.round((tm2 - tm1) / 1000000);
 }
 
+function diffInMilliseconds(tm1, tm2) {
+    return Math.round((tm2 - tm1) / 1000);
+}
+
 function toSeconds(tm) {
     return Math.round(tm / 1000000);
 }
 
+function toMilliseconds(tm) {
+    return Math.round(tm / 1000);
+}
+
 function addSeconds(tm, n) {
     return tm + n * 1000000;
 }