diff --git a/addons/hr_holidays/static/src/views/calendar/calendar_model.js b/addons/hr_holidays/static/src/views/calendar/calendar_model.js
index 17cc0b89a0c..baf496de1df 100644
--- a/addons/hr_holidays/static/src/views/calendar/calendar_model.js
+++ b/addons/hr_holidays/static/src/views/calendar/calendar_model.js
@@ -1,7 +1,12 @@
 /** @odoo-module */
 
 import { CalendarModel } from '@web/views/calendar/calendar_model';
-import { deserializeDateTime, serializeDate, serializeDateTime } from "@web/core/l10n/dates";
+import {
+    deserializeDate,
+    deserializeDateTime,
+    serializeDate,
+    serializeDateTime,
+} from "@web/core/l10n/dates";
 
 export class TimeOffCalendarModel extends CalendarModel {
     setup(params, services) {
@@ -31,14 +36,18 @@ export class TimeOffCalendarModel extends CalendarModel {
             context["default_employee_id"] = this.employeeId;
         }
 
+        function deserialize(str) {
+            // "YYYY-MM-DD".length == 10
+            return str.length > 10 ? deserializeDateTime(str) : deserializeDate(str);
+        }
         if ("default_date_from" in context) {
             context["default_date_from"] = serializeDateTime(
-                deserializeDateTime(context["default_date_from"]).set({ hours: 7 })
+                deserialize(context["default_date_from"]).set({ hours: 7 })
             );
         }
         if ("default_date_to" in context) {
             context["default_date_to"] = serializeDateTime(
-                deserializeDateTime(context["default_date_to"]).set({ hours: 19 })
+                deserialize(context["default_date_to"]).set({ hours: 19 })
             );
         }
         return context;