Windows 7, 8, and Vista - Changing the System Date and Time
This document explains how to change the system date and time in Windows 7, 8, and Vista.
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Right-click on the time in the bottom-right of the screen and select Adjust Date/Time.
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Click on the Change date and time... button.
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Use the arrows to the left and right of the month/year and the arrows to the right of the clock to change the time to the correct time.