An issue I ran into by changing the date & time of a request. In the field 'Scheduled date' only the date is shown and not the time. When saving the request the time is being changed to 0:00.
Of course, if you really want to reschedule a request this is rather annoying.
My solution was to change one line of code in the file 'administrator/components/com_autotweet/views/requests/tmpl/form.php'.