I was thinking about it a little more and I think it can be done. I'll have to experiment a little and see what I can come up with.

the problem isn't just 'is this Friday?', because I can do that using date_transform(), but more importantly, "is this the *third* Friday?". And things can get more complex from there.

I'm going to give it try.

[edit]
I just made this quick form:
http://www.perlmad.net/form.html

Any suggestions/comments?

Philip
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Limecat is not pleased.