diff --git a/src/components/views/messages/DateSeparator.js b/src/components/views/messages/DateSeparator.js
index 7acc9bd61e..3f75c3e749 100644
--- a/src/components/views/messages/DateSeparator.js
+++ b/src/components/views/messages/DateSeparator.js
@@ -49,7 +49,7 @@ module.exports = React.createClass({
             label = days[date.getDay()];
         }
         else {
-            label = DateUtils.formatFullDate(date);
+            label = DateUtils.formatFullDate(date, this.props.showTwelveHour);
         }
 
         return (