diff --git a/static/js/muting.js b/static/js/muting.js
index eeaf4a9e65..5b0d48e288 100644
--- a/static/js/muting.js
+++ b/static/js/muting.js
@@ -3,17 +3,11 @@ import {FoldDict} from "./fold_dict";
 import {page_params} from "./page_params";
 import * as stream_data from "./stream_data";
 import * as timerender from "./timerender";
+import {get_time_from_date_muted} from "./util";
 
 const muted_topics = new Map();
 const muted_users = new Map();
 
-function get_time_from_date_muted(date_muted) {
-    if (date_muted === undefined) {
-        return Date.now();
-    }
-    return date_muted * 1000;
-}
-
 export function add_muted_topic(stream_id, topic, date_muted) {
     let sub_dict = muted_topics.get(stream_id);
     if (!sub_dict) {
diff --git a/static/js/util.js b/static/js/util.js
index 01f06d158a..57c02f6e2d 100644
--- a/static/js/util.js
+++ b/static/js/util.js
@@ -354,3 +354,10 @@ export function filter_by_word_prefix_match(items, search_term, item_to_text) {
 
     return filtered_items;
 }
+
+export function get_time_from_date_muted(date_muted) {
+    if (date_muted === undefined) {
+        return Date.now();
+    }
+    return date_muted * 1000;
+}