Check whether a year is a leap year (366 days, with 29 February) and find the next leap years.
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Rule: divisible by 4, but not by 100 (unless also by 400). Leap years have 29 February.
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A year is a leap year if it is divisible by 4, except years divisible by 100 that are not also divisible by 400. This adds 29 February and gives the year 366 days:
2024 and 2000 are leap years; 2026, 1900 and 2100 are not. Next: 2028, 2032, 2036.
A year with 366 days instead of 365, which has 29 February. One day is added every 4 years to align the calendar with the astronomical year (≈365.2422 days).
A year is a leap year if it is divisible by 4, except years divisible by 100 that are not divisible by 400. So 2024 and 2000 are leap years, but 1900 and 2100 are not.
1900 is divisible by 100 but not by 400, so it is not a leap year. 2000 is divisible by 400, so it is. The divisible-by-400 rule corrects the over-counting.
No. 2026 is not divisible by 4, so it has 365 days and February has 28. The next leap years are 2028, 2032, 2036.
29 days, versus 28 in an ordinary year. The added day is 29 February.
After 2024 come 2028, 2032, 2036, 2040 — every 4 years, with century exceptions (2100 will not be a leap year).
Because a solar year lasts about 365.2422 days. Without the extra day every 4 years, the calendar would gradually drift out of step with the seasons.
Their birthday calendrically “falls” only every 4 years. In non-leap years it is usually celebrated on 28 February or 1 March.