go to settings, its in the menu and change it there.
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You go on Nintendo ds settings and go on date and change the date to a previous date.
Taking the battery of a DS Lite out for about a minute resets the Date/Time and Player info, but the touchscreen calibration shouldn't change
Change the date on your DS/DSi
Nintendo invented the Nintendo DS and the Nintendo DS lite.
you change the date on your ds and it should change on the game :)