Starry Night reads the time from your computer's Control Panel. Make sure it is set correctly there. On Windows, you can access the clock by clicking the Start button on your desktop and choosing Settings->Control Panel, then double-clicking on “Date/Time” in the list which appears. On the Mac, click on the Apple menu, then select Control Panels->Date & Time. Also, make sure that you are starting Starry Night by running the Starry Night application itself, not a saved Starry Night file.