[Zope] wrong day

Ok, silly me, the date is stored ok, but is reported wrong: <I><dtml-var data fmt="%Y/%m/%d"></I><BR> gives me 1999/12/31 instead of 2000/01/01 -- "This company has performed an illegal operation and will be shut down. If the problem persists, contact your vendor or appeal to a higher court." - Signal11 on slashdot