- If you can divide last two digits of the year completely with 4, it would be a leap year
Eg. xx40, xx24, xx96 etc are leap years and
xx39, xx41, xx42 are not.
- In the case of centuries, if you can divide the year with 400, it would be a leap year.
Eg. 1600, 2000 etc are leap years and
1500, 1900, 2100 are not.