Gregorian year check
Gregorian ruleLeap Year Calculator
Check whether a year has 365 or 366 days under the Gregorian leap-year rule.
Gregorian calendar
Common year2026 has 365 days.Gregorian rule: divisible by 4, except century years must also be divisible by 400.
Century-year rule
Years divisible by 100 are not leap years unless they are also divisible by 400.