diff --git a/addons/web_calendar/static/src/js/web_calendar.js b/addons/web_calendar/static/src/js/web_calendar.js
index 4d113ebe588..d38dc2d673c 100644
--- a/addons/web_calendar/static/src/js/web_calendar.js
+++ b/addons/web_calendar/static/src/js/web_calendar.js
@@ -841,7 +841,7 @@ var CalendarView = View.extend({
      * between given start, end dates.
      */
     get_range_domain: function(domain, start, end) {
-        var format = time.date_to_str;
+        var format = time.datetime_to_str;
         var extend_domain = [[this.date_start, '<=', format(end)]];
         if (this.date_stop) {
             extend_domain.push([this.date_stop, '>=', format(start)]);