Whenever you need to select a date in Resident either it is for invoice due date or time frame of your debtors report you have two options. 

1. You can simply type date in the empty date field using following format: Day/Month/Year (DD/MM/YYYY)

2. Another way is to click on a little calendar icon(please see picture above) on the right-hand side of the date field. That will open for you calendar from which you can select date manually.

If you want quickly switch between years you can click on the year in the top left corner of the calendar.