[Zope] year 2k-bug entering 30.12.2000 in properties type date ???

hi, I have created a Zclass and property sheets "Konstanten". Going to "/Control_Panel / Products / DOCProdukt / DOCClass / propertysheets / common / Konstanten/" and adding a Property my_date of type date and entering 30.12.2000 into the value-field wil bring me a Zope-error: Error Type: Invalid Date-Time String Error Value: 30.12.2000 Entering 30.12.1999 works fine. Is it a year 2k-bug I cannot enter a date like dd.mm.2000 ??? I use Zope 2.0.1. thank you regards nico