Comment Let's have some fun! (Score 1) 69
If and when you find yourself in a jurisdiction where some sort of age verification law is in effect, just remember that it's very unlikely that the law will require the date to be given in the Gregorian Calendar. There are many other possibilities, and as an example, here's a website that can convert your birth date into the Hebrew Calendar. This has many advantages: first, the date is written from right to left, not left to right, which should have interesting effects on any software trying to use it. Also, of course, the names of the months are different as is the year number. And, just to make things even more confusing, the conversion is different for different years, largely because some of the months have a different number of days in different years to avoid certain holidays landing on the wrong day of the week, and Hebrew leap years are done by duplicating a specific month. I'm sure that there are other examples, but this is the one I'm familiar with. Feel free to list other interesting possibilities.