diff --git a/addons/hr_homeworking/static/src/calendar/common/calendar_model.js b/addons/hr_homeworking/static/src/calendar/common/calendar_model.js
index 70d05011031..3872704b6ee 100644
--- a/addons/hr_homeworking/static/src/calendar/common/calendar_model.js
+++ b/addons/hr_homeworking/static/src/calendar/common/calendar_model.js
@@ -34,7 +34,7 @@ patch(AttendeeCalendarModel.prototype, {
         for (const day of rangeInterval) {
             const startDay = day.s;
             const dayISO = startDay.toISODate();
-            const dayName = startDay.weekdayLong.toLowerCase();
+            const dayName = startDay.setLocale("us").weekdayLong.toLowerCase();
             if (!(dayISO in events)) {
                 events[dayISO] = {};
             }