http status code for an expired link?

Question

guys which is the correct status code for a link that expires in a certain amount of time?

I have thought to send a 404 after the expiration but maybe there is a better http status to send.

Example of link:

mysite/dir/062011/file.exe (<- working only within 06-2011)

Thanks

Answer 1

How about 410 "Gone"?
See: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

Answer 2

410 Gone  The requested resource is no longer available at the server and no forwarding address is known. This condition is expected to be considered permanent.