AR Age Code

Has anyone written the programs that keep the AR Age Code in synch with the Age 
Date/Terms Due date and is willing to share it?  For example, if an invoice is 
created on June 30th it is one day old after the AR Month End Close.  However, 
if you go into the customer master inquiry, the invoice appears under the 30 
day bucket.  If you then run an Aged Receivables Report (either with Specific 
Dates or the AM/Plus version with number of days), the numbers will never match.

I know that I could run a custom program to reset the Age Code and run the Paid 
Item Purge to reset the buckets but was hoping someone already has done it.

Thanks...
Eric