How to change the date in Windows XP
Double-click the mouse on the clock icon in the system tray (lower right corner of the screen). To change the month in the appeared properties window, under "date" click on the down arrow to the right of the field that indicates the current month, and select new. Year can be changed by pressing the up and down arrows to the right of the appropriate field. To select a date, click the mouse on the desired number.
Because of the complex processes in electronic devices , the computerand the system starts to diverge from the true time. You can get rid of the discrepancies if the computer connected to the Internet. Go to the tab "Internet Time", check the box next to "synchronize" and click OK.
How to change the date in Windows 7
To change this option, you will need administrator privileges. Click on the clock icon and click on "Change date and time". In the "date and time" click "Change date and time". In the date field, change the current value of the left and right arrows.
They break you because incorrectly chosen time zone. Click "Change time zone" and select your location. To synchronize system timer with world time, go to the tab "Time on the Internet.