last build date of a package

[David Mosberger <davidm@napali.hpl.hp.com>]

This must be a FAQ but I can't seem to find the answer anywhere: with
"apt-cache show PKGNAME", I can get all kinds of interesting
information about a package.  However, I don't see the _date_ the
package was last built.  Am I missing something obvious?  (Yes, I can
go to the "pool" and check the date there, but that's an extra step
which I'd like to avoid.)

	--david