From: Peter Szinek Date: 2006-12-18T03:43:31+09:00 Subject: Re: DateTime > it says that the constant DateTime is uninitalized. > > Can anyone help? Sure. You should add this line: require ‘date’ you can find some more examples on date/time and other simple exercises on my blog: http://www.rubyrailways.com/implementing-15-exercises-for-learning-a-new-programming-language/ HTH, Peter __ http://www.rubyrailways.com