Need help (Payment Scheduling)

Need help about payment scheduling?

for example, Payment Starts on : 01/15/2013 (Date Picker)
Payment type is : Semi monthly (2 Cutoffs in 1 month)
Payment terms is : 6 (equivalent is 3 months)

the result I am looking for is :

01/15/2013
01/31/2013
02/15/2013
02/ last day of february
03/15/2013
03/31/2013

Result will be displayed on listview

Any help?