How to calculate XNPV with blank cells?

Ok, so I am having trouble calculating NPV based on cashflow dates and I am not sure how to solve this problem. It would be great if some excel Guru could help me out:

I have a massive file that contains daily dates across (eg from B3 to all the way across to for example XX3)
Then I have thousands of contracts listed in the rows below and their cash flows below a corresponding date.(the day on which the cash flow is expected)
Not one of the contracts have a cashflow corresponding to every date. (there are many blank cells in the rows containing the cash flows.

How can I calculate the XNPV for each of those contracts?

Any thoughts would be greatly appreciated.

Thanks!