1 files changed, 12 insertions, 1 deletions

diff --git a/server/lib/activitypub/activity.ts b/server/lib/activitypub/activity.ts
index cccb7b1c1..e6cec1ba7 100644
--- a/server/lib/activitypub/activity.ts
+++ b/server/lib/activitypub/activity.ts
@@ -4,6 +4,17 @@ function getAPId (object: string | { id: string }) {
   return object.id
 }
 
+function getActivityStreamDuration (duration: number) {
+  // https://www.w3.org/TR/activitystreams-vocabulary/#dfn-duration
+  return 'PT' + duration + 'S'
+}
+
+function getDurationFromActivityStream (duration: string) {
+  return parseInt(duration.replace(/[^\d]+/, ''))
+}
+
 export {
-  getAPId
+  getAPId,
+  getActivityStreamDuration,
+  getDurationFromActivityStream
 }