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.
According to the API, this method returns "A long value representing the time the file was last modified, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970)". Compare this to the description for the new Date(long) constructor - the long value there has the same meaning. (It's also used in System.currentTimeMillis().) This means that you can construct a new Date using this value: