안녕하세요.
int hour = getCurrentHour(timePicker);
int minute = getCurrentMinute(timePicker);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, hour);
calendar.set(Calendar.MINUTE, minute);
calendar.set(Calendar.SECOND, 0);
요렇게 하면 될듯하네요.