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Glossary Data & Encoding

Leap year

A leap year has 366 days, with 29 February added, to keep the calendar aligned with the Earth's orbit.

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In more detail

A year is a leap year if divisible by 4, except century years, unless divisible by 400: 2024 and 2000 are leap years, 1900 and 2100 are not. See How Dates and Time Zones Work.

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See also

  • Glossary UTC
    UTC is the global reference time standard from which all time zones are defined as offsets.
  • Glossary ISO 8601
    ISO 8601 is the international standard for writing dates and times unambiguously, in the order year, month, day.
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