This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
That should work. In the first method, datetime is a local variable. In the second method it was either an instance variable, or it wouldn't even compile. My solution solves that problem by passing the local variable to the second method.