FWIW, the unit-conversion hack still works in Snow Leopard:

property zdate : date "Monday, August 10, 1992 11:00:00 AM"
set file_name to ((current date) - zdate as feet as text) & ".html"


-- 
Shane Stanley <[log in to unmask]>
AppleScript Pro, April 2010, Florida <http://www.applescriptpro.com>