Hi Julie,

To add on to what lind1006 said, we publish articles with the use of a UI Action called 'Publish'.   (We do not use a workflow, but rather use UI actions, business rules etc to handle the articles lifecycle).   The code in 'Publish' UI action reads the value selected in the   'Expiration' field (3 months, 6 months, 1 year etc...) and calculates the 'Valid To' date from the current sysdate, which happens to be the date we published the article.

I have attached the code from our UI action below....hopefully this helps!

-Kari