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Gregorian Calendar Validator

Leap Year Checker

Instant mathematical verification with solar alignment rules, century exception breakdowns, and calendar statistics.

Quick Jumps:
Gregorian 3-Step Mathematical Proof:
Rule 1: Divisible by 4?
2026 ÷ 4 = 506.50 (Has remainder: NO)
FAIL
Rule 2: Divisible by 100? (Century Year Exception)
2026 ÷ 100 = 20.26 (Not a century year: Standard leap rule applies)
NORMAL
Rule 3: Divisible by 400? (Centurial Leap Rule)
2026 ÷ 400 = 5.07 (Not divisible by 400)
N/A

All Leap Years in the 2000s (2000–2099)

25 Leap Years

Status & Calendar Metrics

2026 is a Common Year
Contains standard 365 days with 28 days in February.
Total Days
365
February Days
28
Total Hours
8,760
Total Minutes
525,600
Previous Leap Year:
Next 5 Leap Years:
Next Feb 29 Leap Day:In 537 days
100% computed on your device. Zero server calls.

Why Do Leap Years Exist?

Earth takes approximately 365.24219 days (365 days, 5 hours, 48 minutes, and 45 seconds) to orbit the Sun once. Because our calendar counts 365 full days, without leap days, our calendar would drift by nearly 6 hours every single year, causing the seasons to drift by 24 days every century!

Every 4 Years (+1 Day)

Adding a leap day every 4 years compensates for 0.25 days per year, slightly overcorrecting by 11 minutes per year.

Century Skip (100 Years)

To counter the 11-minute overcorrection, century years divisible by 100 (like 1700, 1800, 1900, 2100) are NOT leap years.

Quad-Century (400 Years)

Skipping every century slightly undercorrects, so years divisible by 400 (like 1600, 2000, 2400) remain leap years!