fixed income - 30360 Daycount Count Convention to find NPV for Bonds

Using a 30/360 day count convention, how can you value the NPV of these cash flows and the discount factor? I know how to discount cash flows but how does it differ using a 30/360 approach? What is the approach that I should be using?

Date       Payments     Discount Factor    Discounted Value
12/31/2012  0               100.00% 
6/30/2013   75,200      

12/31/2013  50,600      
6/30/2014   86,700      
12/31/2014  77,000      
6/30/2015   74,400      
12/31/2015  25,200      
6/30/2016   70,700      
12/31/2016  81,800