diff --git a/addons/mail/static/src/js/views/activity/activity_cell.js b/addons/mail/static/src/js/views/activity/activity_cell.js
index 7dc63d587ad..fe5b4e204f8 100644
--- a/addons/mail/static/src/js/views/activity/activity_cell.js
+++ b/addons/mail/static/src/js/views/activity/activity_cell.js
@@ -27,7 +27,7 @@ const ActivityCell = KanbanActivity.extend({
     _render() {
         // replace clock by closest deadline
         const $date = $('<div class="o_closest_deadline">');
-        const date = new Date(this.record.data.closest_deadline);
+        const date = moment(this.record.data.closest_deadline).toDate();
         // To remove year only if current year
         if (moment().year() === moment(date).year()) {
             $date.text(date.toLocaleDateString(moment().locale(), {