diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index d6ed85fedad..9c1cf916a41 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -2097,7 +2097,8 @@ instance.web.DateTimeWidget = instance.web.OldWidget.extend({
             changeMonth: true,
             changeYear: true,
             showWeek: true,
-            showButtonPanel: true
+            showButtonPanel: true,
+            firstDay: Date.CultureInfo.firstDayOfWeek
         });
         this.$element.find('img.oe_datepicker_trigger').click(function() {
             if (self.get("effective_readonly") || self.picker('widget').is(':visible')) {