Another thing to find out would be how your putting the date into the data file. That's something we would need to know to figure out the "prior date" portion.
I can't come up with a quick non-CPAN way to do that to cover Dec 31 -> Jan 1 changes, and also lastday(month)->firstday(nextmonth) changes.
Any folks have any ideas on how to parse the date, assuming they're stored as MM/DD/YYYY (if they're separated fields, they can be join()'d, and if DD/MM/YYYY or some other format, it should be easily changable to MM/DD/YYYY)? Dates are probably one of the most irritating things when it comes to programming. =]
-marius
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