diff --git a/addons/mail/static/src/js/activity.js b/addons/mail/static/src/js/activity.js
index 4d3d7adee50..59b32f32023 100644
--- a/addons/mail/static/src/js/activity.js
+++ b/addons/mail/static/src/js/activity.js
@@ -140,7 +140,8 @@ var Activity = AbstractActivityField.extend({
                     nbPlannedActivities: nbActivities.planned,
                     nbTodayActivities: nbActivities.today,
                     nbOverdueActivities: nbActivities.overdue,
-                    date_format: time.getLangDatetimeFormat(),
+                    date_format: time.getLangDateFormat(),
+                    datetime_format: time.getLangDatetimeFormat(),
                 }));
             } else {
                 self.$el.empty();
diff --git a/addons/mail/static/src/xml/activity.xml b/addons/mail/static/src/xml/activity.xml
index da3e63772a6..fadb93dfa7d 100644
--- a/addons/mail/static/src/xml/activity.xml
+++ b/addons/mail/static/src/xml/activity.xml
@@ -40,7 +40,7 @@
                                     </dd>
                                     <dt>Created on</dt>
                                     <dd class="mb8">
-                                        <t t-esc="activity.create_date.format(date_format)"/>
+                                        <t t-esc="activity.create_date.format(datetime_format)"/>
                                     </dd>
                                     <dt>Assigned to</dt>
                                     <dd class="mb8">