Daily away mode works when set to 12:00 AM start. (6 AM end).
Setting start time earlier, even at 11:59 PM, generates error message op Invalid time listed. The time entered would lock you out of your site now. Please try again.
At time of setting UTC was 23:00:00 and local time was 16:00:00
iThemes Security 4.0.2 (clean install)