Calculate Aging difference by days / months

Autocount Accounting is allow user to calculate Debtor or Creditor Aging report difference by days or month.
We can choose this setting from Tools - Options menus:

1. When option Differences of days is selected, the system will use calculate the number of days between report date and the invoice date, and use this number of days to determine which month should the outstanding amount fall in.
2. When option Differences of months is selected, the system will extract the month portion of report date and the invoice date, then calculate the number of months difference between them, and use this month difference to determine which month should the outstanding amount fall in.
3. For example, I have one invoice dated 28 November 2008, my report date is 10 December 2008,
   
4. Using Differences of days option, the outstanding amount will be in Current.
5. Using Differences of months option, the outstanding amount will be in 1 Month.