Answering my own question: > Am I the only one whose bobo_modification_time started today with > /2000/2/29 instead of /2000/03/01? No, I'm obviously not the only one, see: http://www.zope.org/Members/thomasW/test It seems to be a bug. hmmm .. and if tomorrow happens the same? .. How was the movie called, which comes to my mind now :) Greetings, Thomas