Counting Unique Values with one criteria between a given date range?

So this is my first post on this forum, mostly because I have spent months lurking and pulling code from other posts. (That's how it should be done on a forum, right ) But I have finally gotten to a problem I haven't been able to solve myself.

This is another unique frequency question also with two conditions. However the difference with my situation is that mine seems to combine two of the common problems, both of which I have solved independently, but have not been able to make work in conjunction.

I need to count unique entries in a list of numbers that fall between a given date range, with one criteria. I have mocked up a sample of my data to explain.