This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It looks good except that I think you should probably use scheduleAtFixedRate instead in order to maintain your 0:00:00 execution time (otherwise the start time can drift towards times when people will be using the system, assuming that's why you want to start at midnight).
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com