Leap Years

A leap year has an extra day, February 29th, to keep our calendar in sync with Earth's orbit. The rule: a year is a leap year if it's divisible by 4, except century years (divisible by 100), which must also be divisible by 400.

Determine whether a year is a leap year, or find how many days February has.

Continue exploring related topics:

• Calendars
• Days, Weeks, Months and Years
• Time Zones