Count down to major global holidays.
Seasonal
Cultural
Religious
Cultural
Cultural
Religious
Cultural
Cultural
Open the Holiday Countdown — the page automatically lists all major holidays sorted by date.
Browse through holidays — each card shows the holiday name, category (religious/cultural/seasonal), and days remaining.
Plan ahead — note the upcoming holidays and plan your celebrations, travel, or gift preparations.
The Julian Day Number (JDN) is a continuous count of days since January 1, 4713 BC. Astronomers use it to simplify date arithmetic — you subtract two JDNs to get the exact number of days between any two dates, no calendar quirks to worry about.
USNO ReferenceThe 24 solar terms divide the year by the Sun's position along the ecliptic. Each term spans exactly 15° of celestial longitude. They are a lunisolar calendar system distinct from the lunar month system, used for agriculture in East Asia for over 2000 years.
WikipediaEaster Sunday is determined by the Computus — a set of rules that finds the first Sunday after the first full moon on or after the March equinox. Butcher's Algorithm (1876) computes it with pure integer arithmetic, valid for all Gregorian years.
Butcher's AlgorithmMeteor showers occur when Earth passes through debris trails left by comets. The International Meteor Organization (IMO) publishes an annual calendar of peak dates. Major showers like the Perseids and Geminids are reliable year after year.
IMO CalendarCountdown to major global holidays: Christmas, Easter (Computed via Butcher's Algorithm), Thanksgiving, Halloween, Valentine's Day, Mother's Day, Father's Day. Free, instant, browser-based. · All calculations execute client-side — zero network requests, zero data transmitted. Holiday dates pre-computed in your browser.