[Koha] Due date "YYYY-MM-DD" is invalid error when checking out books

I am still setting up the library system, and now that they finally feel ready to start lending books, I find that I get the error in the subject whenever they try to lend a book. Red faces doth abound. I've tried setting the dates. I've even reset the dates. where am I screwing up? All the best Suchetha -- Check my photo album: http://picasaweb.google.com/suchetha Rants Raves and Miscellaneous Musings: http://raramimu.blogspot.com Why do I smell brimstone? And what am I doing in this hand-basket?