iOS: Research shows that light exposure is a major factor in your body's rhythms, so mathematicians have built an iPhone app called Entrain that cuts jet lag time and gets your body adjusted to a new time zone faster.
Developed by researchers at the University of Michigan, Entrain is a guide that takes user input to give you a schedule that promises to overcome jet lag faster. It doesn't use light sensors or any other automatic input, so it's important that the user submits data—it's not magic!
The science behind the app is that light is the primary diving input to the body's circadian rhythms, so if you feed Entrain your current light input schedule, it can figure out light stimulus that moves your body clock from one phase to another. Detailed math is available in a paper at PLOS:
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