You can check my availability if you want and I will show you how to set it up. I can help show you how to set up a graph where it groups by week or month for you. My live availability is on my site.
I don’t think it will take more than an hour. If we don’t get done in that time you will at least be able to finish it on your own after I show you how.
As an idea also, if Group by: doesn’t work, you can extract the month from a date and search for it a lot easier. Sometimes it’s just easier to extract it before hand. This is just a quick sample on how you could do it. You can take the idea and match it to your needs. Like this example.