Due date of lease-in contract

Hi Experts,

I was wondering how to achieve following due date:

Frequence is yearly pay. starting from 10.01.2014, and due date is  15.02.2014,

yearly pay and frequence starting date i can find place to input.

Regarding due date, i can use only Due date(+/-) field  which is configured and it has to be redefine.

Do you know is there any field i can input a calendar date as due date ?

Thanks

Ian