SuperClock

SuperClock! displays the time and date near the right end of the menu bar. If you're using a portable Macintosh, it will also display the battery level; the battery icon will include a little lightning bolt when the battery is charging.

To use SuperClock!, put it into the System Folder or the Control Panels folder (for System 6.x or 7.x, respectively), and then restart the Macintosh. Holding the shift key down when starting up will prevent SuperClock! from being installed.