set currentDate to current date
set today to weekday of currentDate
if today is Monday then set dueDate to currentDate + (3 * days)
if today is Tuesday then set dueDate to currentDate + (3 * days)
if today is Wednesday then set dueDate to currentDate + (5 * days)
if today is Thursday then set dueDate to currentDate + (5 * days)
if today is Friday then set dueDate to currentDate + (5 * days)
if today is Saturday then set dueDate to currentDate + (4 * days)
if today is Sunday then set dueDate to currentDate + (3 * days)
return ((weekday of dueDate) & “, ” & (month of dueDate) & ” ” & (day of dueDate)) as text

There are probably simpler or more elegant ways, but this seems to do the trick–if I send something out on Monday it gives me Thursday, if I send something out on Thursday it gives me next Tuesday, etc. If you want five business days in the future, or some other number, you can modify the numbers in each line accordingly to get the right day in the future for each weekday. If you want the date in a different format you can do that too by modifying the last line. (I think there are ways to return months as integers and such if you want something like 1/1/2010.) Save this as an AppleScript snippet in TextExpander and then insert it within another snippet.

Question. In my spreadsheet program (Numbers) I create invoices in Japanese for my clients in Japan. On the first page of the invoice, I insert the date using TextExander using %Y年 %m月 %d日. It works and inserts the date like this — 2009年 04月 01日 — which is correct. Then on the 2nd and third pages, I would like the date to be one day less, for example, 2009年 03月 31日. Is this possible to automate the date insertions on the second and third pages of my invoice using TextExpander?

As you said. People can subscribe and i can improve them in the background. (Which is amazing!)