A leap year patches the gap between Earth’s orbit and a 365-day count. The Gregorian rule adds 29 February most years divisible by 4, with 100- and 400-year exceptions. Korean talk may delay a wedding in a leap year or prefer a lunar leap month for a grave move; Scotland has a 29 February proposal custom; jokes treat leap-day birthdays as special. Arithmetic and taboo are different layers. This page does not weld them into destiny.
Common years have 365 days; leap years 366. Divisible by 4 is a leap year unless divisible by 100 but not 400. 2100 is common; 2000 was leap. The list below is that rule, not an omen table. Leap-day birthdays are often celebrated on 28 February or 1 March by local custom.
East Asian lunisolar calendars insert a leap month to track moons and solar terms. Talk that “the spirit is away” or that reburials are easier then bundles with son-eomneun-nal customs. We do not republish a paid lunar almanac day-by-day.
Some families avoid leap-year weddings (uneven pair, long year, ancestors resting). Others treat a leap month as auspicious. Marriage and infant health sit in relationships, medicine, and law — not a calendar stamp. If the venue is booked, superstition is a weak reason to break the contract.
Headlines about leap-year crashes or divorces need sample and definition checks. An extra day can add extra events. 29 February in novels is a plot device. Superpowers for leap-day births are fiction.
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Calendar arithmetic, not a marriage ban list.
For entertainment and cultural context. Blood-type tropes, palmistry, and luck lore are not prediction, finance, medical, or legal advice.