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Leap year check

Free · No sign-up

Check whether a year has 366 days under the Gregorian leap-year rule.

  1. 1 Input text
  2. 2 Show result
  3. 3 Save file

Text stays in this browser. Nothing is uploaded.

Supported input

100,000 · UTF-16 / 1 MB · UTF-8

Use the displayed date/time format. Weekdays mean Monday–Friday; public holidays are not included. Day counts exclude the end date. A time-only end before the start means the next day.

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