[otrs] Ticket time input fields

Hi, I have a question regarding time and date input fields, i.e. when changing ticket to pending. How is determined day and month inputs order? And how can I change it? Is it taken from locale or somewhere else? And is there any simple way how to change default value? We postpone almost all tickets to night hours (due to smaller servers load) so it would be great to change this algorithm to provide default value like 22:00 today. Radek