Open Date and Time in Control Panel.
On the Date & Time tab, select the item you want to change.
To change the month, click the arrow in the month list, and then click the correct month.
To change the year, click the arrows in the year list.
To change the day, click the correct day on the calendar.
To open Date and Time, click Start, click Control Panel, click Date, Time, Language, and Regional Options, and then click Date and Time.
Windows uses the date setting to identify when files are created or modified.
You can also open the Date and Time dialog box by double-clicking the clock on the taskbar.
Update the time on your computer
Change the way your computer displays the date
Change your computer's time and time zone