CalculationTime

Leap Year Calendar

Time Duration Calculator
CalculationTime

Leap Year Calendar

A printable Gregorian leap-year checker for February 29, century exceptions, 400-year rhythm and nearby leap-year planning beside the CalculationTime clockface.

Inputs, result, proof and time.

Use the instrument above, then check the calculation record, assumptions and related tools below.

Leap Year Checker

Build a printable leap-year report

CalculationTime Leap Year Calendar

2026

Common year: February has 28 days
Status
Common
Total Days
365
Previous Leap
2024
Next Leap
2028
Rule result2026 is not a leap year
February 29No February 29 in this Gregorian year
Day of yearNot present
Compare2030 is common (4y apart)

February 2026

28-day February
MonTueWedThuFriSatSun12345678910111213141516171819202122232425262728

Gregorian Rule Checks

Divisible by 42026 leaves remainder 2
Century exception2026 is not a century year
400-year rescue2026 is not divisible by 400

Nearby leap years

201620202024202820322036

Planning Context

2026 has no February 29. The next leap day after January 1 2026 is 789 days away.

Notes

Use this report for subscriptions, birthdays, payroll checks, school worksheets and long-range planning notes.

Assumptions

Gregorian rule, proleptic browser Date arithmetic, year range 100-9999, local noon dates for weekday labels.

Leap Output Room

Keep February 29 explainable, printable and auditable

The tabs separate the rule result, print behaviour, civil-calendar limits and source notes so the page reads like a small product rather than a bare checker.

Rule test

The report shows every part of the Gregorian leap-year rule

CalculationTime checks divisibility by 4, the century exception and the 400-year rescue before building the February calendar panel.

  • Leap status, previous leap year and next leap year remain visible in the report header.
  • February 29 gets its own weekday and day-of-year context when it exists.
  • The nearby leap-year strip helps compare planning windows around the selected year.
year -> divisible by 4 -> century exception -> 400-year rescue -> February 29 report

Method

Leap years follow the Gregorian century rule

A Gregorian year is a leap year when it is divisible by 4, except years divisible by 100 are ordinary years unless they are also divisible by 400. The tool builds February 29 with browser Gregorian Date objects at local noon.

Accepted years

The browser controls accept 100 through 9999 for civil planning and examples, using the proleptic Gregorian calendar exposed by JavaScript.

Print path

The print button opens browser print. The print stylesheet hides controls and keeps the result, rule checks, nearby leap-year list, notes and assumptions.

Limits

This is not a historical jurisdiction converter. Regions adopted the Gregorian calendar at different times, so old local records need specialist calendar history.

Source Notes

Gregorian rule and platform basis

The leap-year test uses the modern Gregorian rule. Browser JavaScript Date objects provide the underlying proleptic Gregorian date arithmetic used for weekday labels and the February 29 calendar panel.

ReferencesEncyclopaedia Britannica: Gregorian calendarECMAScript Date objects