Quarterly appointments

Hello,

I'm working on iCalendar import/export for the reservations module in 
our product. So far, everything works quite fine, apart from the fact 
that we support quarterly reservations. For example, "every second 
Tuesday of each quarter" or "every 70th day of each odd quarter".

As iCalendar does not support FREQ=QUARTERLY, I will have to rewrite 
these recurrence rules. Of course I can go and calculate everything 
manually in my code, but that is bound to contain errors. So, if anybody 
has got suggestions about how to tackle this, they would be most welcome.

If this is the wrong list to ask, then a pointer to the right place is 
fine as well, of course.

Thanks in advance,

Cheers,

-- 
Sander Koning
TOPdesk Ontwikkeling

TOPdesk
Martinus Nijhofflaan 2, 2624 ES Delft
Postbus 559, 2600 AN Delft

T  (015) 270 09 00
F  (015) 257 52 56
W  www.topdesk.nl