Word of advice: If you're going to "time-travel" only do so if the computer you are playing on is yours and yours alone. Then if you mess up other programs on your computer, only you will be disappointed.

My ex-husband did something similar and turned the clock ahead on a game of his, and basically cheated me out of a free 30-day trial on a program, and turning back the clock didn't give me the free days back, so I bought the program without getting to try it out fully. I was later sorry I'd bought it as it didn't do what I'd been hoping.

(I didn't divorce him because of this, but just a word of caution to those who do change your clock.)