http://anoved.net/2007/05/backdate-yojimbo-items/#comment-645
The same issue and workaround presumably apply to this related script:
http://anoved.net/2007/05/backdate-yojimbo-import/
Jim
As an aside, backdating should no longer be necessary when using
Yojimbo 2.x, right? It seems to carry over the creation and
modification date of imported files and introduces a new imported date
field.
-Dennis