Appointments back-end hours does not match settings

On main settings, I have set hours to 30 minutes also admin time hours to 30 mins. Front-end is working ok, but when I try to manually add an appointment in the back-end I can not set it to start ex. 9.30, only 9.00, 10.00, 11.00. what does not work for providers that set their time slot in .30 / .30

Also, the date format for appointment "created on" does not match installation settings.