You know those people who somehow manage to pull the day of the week out of thin air, past or present, no matter how far off a date is? As it turns out, all it takes is a few simple mental tricks and you can wow the world with your uncanny ability to figure out any date's day of the week.

You can go about this in a few different ways depending on your level of commitment. Below I'll highlight three methods, from easiest to most complicated. The first is also cheating: It involves using the internet rather than feats of mental acuity. The second and third methods both employ a little clever mental math.