add to start date and excluding days using workday not calculating right

Hi,

I trying to create a schedule that excludes holidays. I have been using =WORKDAY($H14+4,1,holiday!B2:B14). The problem is it is not calculating correctly it should be 1/2/2015 but returns 12/29/14. I know it is something that I'm doing any direction or advise would be greatly appreciated. I have attach a sample work sheet.

Thanks in advance,
Tom