You don't need to completely disconnect your ethernet cable. Just don't log into any profiles on your Xbox so that you're not connected to Live. Then go change the system clock and play the demo. As noted by gstatus904, logging into Live automatically adjusts your system clock to the correct date and time which means the Too Human trick won't work.
It's an easter egg. Plain and simple. Believe it or not, some people didnt know how to change the date (year) by either not logging on to a profile or pulling out their ethernet cable.
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