Two Calendar controls, dateFrom and dateTo, problem

Hello, I have two Calendar controls, dateFrom and dateTo. When I select date from dateTo calendar control, I would like to get selectedDate property set to some specific time (eg 11:59 PM). If that's not possible, how could I solve a problem when selecting the same date in dateFrom and dateTo calendar controls, which, by default, returns 12:00:00 AM time and thus not returning any result from database (eg, dateFrom.SelectedDate is 6/2/2014 12:00:00 AM and dateTo.SelectedDate is 6/2/2014 12:00:00 AM). Thanks a lot, regards