count between dates

Hi,

I have a list Open Dates and Closed Dates. What im am trying to achieve is between those dates how many times a 10 day marker was hit, a 20 day, a 25 day and a 30+ days, before the call got closed. If there is no closing dates than nothing will be counted. So in my summary i will have the months listed and than going across the top the headngs 10,20,25,30+ and than beneath that the number of calls that reached the 10,20,25,30+ day period.

Ive attached an example of what im trying to achieve, although its no where near to complete, in Cell F7 i have attempted something but its no where close. Any hint or a point in the right direction would be appreciated

Thanks

Sal