1900 was not a leap year as it is divisible by 100 but not 400
In the Gregorian calendar three criteria must be taken into account to identify leap years:
The year can be evenly divided by 4;
If the year can be evenly divided by 100, it is NOT a leap year, unless;
The year is also evenly divisible by 400. Then it is a leap year.
Biting the hand that feeds IT
