What is the leap year calculation? How do I calculate the rules for leap year?
The rule for determining leap years is simply this: every year that is divisible by four is a leap year, except those that are divisible by 100 but not 400. For practical purposes going forward, this means that leap years will occur every four years from now (2012, 2016, 2020, etc.) until we reach 2100, which will NOT be a leap year. However, because of the limitations of human life spans, it is unlikely that anyone reading this today will live long enough for this to be a concern. But if you do manage to survive until the end of the 21st century, just remember that February 2100 will only have 28 days.
