If you are getting the dates from a database dynamically, you can sort the results by the date and group them by months.
I'll attach a screen shot of my data setup so you can have a reference.
![](/forums/attachments/35922/cache/var/www/vhosts/webassist.com/user_uploads/forums/attachments/35922/proportion/Screen%20shot%202009-12-28%20at%2010.08.36%20AM_w99_h100/Screen%20shot%202009-12-28%20at%2010.08.36%20AM_11170737.jpg)
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