diff --git a/addons/hr_attendance/hr_attendance.py b/addons/hr_attendance/hr_attendance.py
index 38364f478e7..49fd35c255b 100644
--- a/addons/hr_attendance/hr_attendance.py
+++ b/addons/hr_attendance/hr_attendance.py
@@ -159,9 +159,9 @@ class hr_employee(osv.osv):
 
             if not self._action_check(cr, uid, employee.id, action_date, context):
                 if action == 'sign_out':
-                    raise osv.except_osv(_('Warning'), _('You are trying to sign out for a date that is posterior to the starting date of the project. Please contact the HR Manager to correct attendances.'))
+                    raise osv.except_osv(_('Warning'), _('You are trying to sign out for a date that comes before the starting date of the project. Please contact the HR Manager to correct attendances.'))
                 elif action == 'action':
-                    raise osv.except_osv(_('Warning'), _('You are trying to sign out and switch project for a date that is posterior to the starting date of the current project. Please contact the HR Manager to correct attendances.'))
+                    raise osv.except_osv(_('Warning'), _('You are trying to sign out and switch project for a date that comes before the starting date of the current project. Please contact the HR Manager to correct attendances.'))
 
             vals = {'action': action, 'employee_id': employee.id}
             if action_date: