Why is 2100 not a leap year?

A year is not a leap year if it's NOT divisible by 4, OR if it's divisible by 100 AND NOT divisible by 400. Since 2100 is divisible by 100 it needs to be divisible by 400 as well in order to be a leap year, which it's not. read more

A year is not a leap year if it's NOT divisible by 4, OR if it's divisible by 100 AND NOT divisible by 400. Since 2100 is divisible by 100 it needs to be divisible by 400 as well in order to be a leap year, which it's not. read more

Rule 1: If the Year is divisible by 100 and the Year is not divisible by 400 then it is not a leap year. (Thus 1900 2100 2200 2300 2500 are not leap years) Rule 2: Years divisible by 4 are leap years; except where specified by Rule 1. read more

Leap years make up for the fact that a year is not exactly 365 days. Having one every four years works if the year is 365.25 days long, which is almost right, but not quite. read more