Counting 2 columns

[want to learn]

I need your help!
I have a column (Lets say A) with dates in it and a column (Lets say B) with names in it. I want a formula for counting column A if it = "certain date" and column B if it is = "certain name. Ex, How many times on 8/1/2007 did "john" appear.
Thanks

 

[want to learn]

JazzSP8,
I found my mistakes,
1)I did not CTRL, SHIFT, ENTER.
2)I removed the {}'s.

It works!
Thanks to both for the help.