The problem with the date is that my e-mail ends up with the wrong time stamp. Laura W . The Control Panel method is standard, but you can get faster results by double clicking on the time shown on your desktop Taskbar. You did not say how slow your clock is, but if it is more than a few minutes a day, you should have it fixed under warranty. The battery that runs the clock when the computer is turned off also has other functions.
Most computer clocks tend to drift a little, but usually only a second or two per day.
If you use the Internet, there are programs available which adjust the clock automatically each time you connect to the Internet. The one that I have is a Freeware version of SocketWatch. It loads into the Taskbar Tray, and is invisible. If you right-click on its icon, it shows the size of the time correction that was made. Copyright 1998 by R. G. Services.