Leap Year Calculator
Test whether a year has 29 February under Gregorian rules.
Century years such as 1900 are not leap years; 2000 is.
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Input Parameters
2024 has 366 days because it is divisible by 4.
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Calculation Formula & Methodology
All arithmetic is processed locally in your browser session using IEEE 754 precision with boundary checks.
Worked example
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Frequently Asked Questions
When should I use the Leap Year Calculator?
Test whether a year has 29 February under Gregorian rules. Always read the formula and assumptions on the page before relying on a figure.
Are the results official?
No. OmniCalc runs the math in your browser from the inputs you provide. Laws, lender policies and medical guidance are not applied automatically.
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