diff --git a/addons/hr_holidays/models/hr_leave.py b/addons/hr_holidays/models/hr_leave.py
index 4b89a1f2ab5d4..d2848401664bc 100644
--- a/addons/hr_holidays/models/hr_leave.py
+++ b/addons/hr_holidays/models/hr_leave.py
@@ -105,13 +105,22 @@ def _default_get_request_dates(self, values):
         # Instead of overwriting all the javascript methods to use
         # request_date_{from,to} instead of date_{from,to}, we just convert
         # date_{from,to} to request_date_{from,to} here.
+
+        # Request dates are determined during an onchange scenario.
+        # To ensure that the values are correct in the client context (UI),
+        # the timezone must be applied (because no processing is carried out
+        # when these dates are received on the frontend).
+        # Note:
+        # Without the application of the timezone, days based on UTC datetimes
+        # will be returned (and will therefore not be correct for the client).
+        client_tz = timezone(self._context.get('tz') or self.env.user.tz or 'UTC')
         if values.get('date_from'):
             if not values.get('request_date_from'):
-                values['request_date_from'] = values['date_from']
+                values['request_date_from'] = pytz.utc.localize(values['date_from']).astimezone(client_tz)
             del values['date_from']
         if values.get('date_to'):
             if not values.get('request_date_to'):
-                values['request_date_to'] = values['date_to']
+                values['request_date_to'] = pytz.utc.localize(values['date_to']).astimezone(client_tz)
             del values['date_to']
         return values
 
diff --git a/addons/hr_holidays/tests/test_leave_requests.py b/addons/hr_holidays/tests/test_leave_requests.py
index 1389926a44e36..52ecd50673d99 100644
--- a/addons/hr_holidays/tests/test_leave_requests.py
+++ b/addons/hr_holidays/tests/test_leave_requests.py
@@ -1152,3 +1152,19 @@ def test_undefined_working_hours(self):
         })
         holiday_status = self.holidays_type_4.with_user(self.user_employee_id)
         self._check_holidays_status(holiday_status, employee, 20.0, 0.0, 20.0, 16.0)
+
+    def test_default_request_date_timezone(self):
+        """
+            The purpose is to test whether the timezone is
+            taken into account when requesting a leave.
+        """
+        self.user_employee.tz = 'Hongkong' # UTC +08:00
+        context = {
+            # `date_from/to` in UTC to simulate client values
+            'default_date_from': '2024-03-27 23:00:00',
+            'default_date_to': '2024-03-28 08:00:00',
+        }
+        leave_form = Form(self.env['hr.leave'].with_user(self.user_employee).with_context(context))
+        leave_form.holiday_status_id = self.holidays_type_2
+        leave = leave_form.save()
+        self.assertEqual(leave.number_of_days, 1.0)