Days Until Pi Day

When is Pi Day?

Pi Day is celebrated on March 14 (3/14) in honour of the mathematical constant π ≈ 3.14159. It is a favourite among mathematicians, teachers, and, naturally, programmers.

Pi Day pairs nicely with the 1234567890 "fun timestamp" as a geeky date worth counting down to.

Pi Day dates, 2026–2035

The next 10 occurrences, with the weekday each falls on and the Unix timestamp of midnight UTC at the start of the day.

The story behind Pi Day

Pi Day was invented in 1988 by Larry Shaw, a physicist at the Exploratorium in San Francisco, who led staff and visitors in a circular parade and served fruit pies at 1:59 pm, the digits that follow 3.14. The date works only in the month-first notation used in the United States, which is why the rest of the world has adopted it as a slightly ironic import, and why July 22, or 22/7, is kept as Pi Approximation Day in countries that write the day first. The United States House of Representatives passed a resolution recognising March 14 as National Pi Day in 2009, and in 2019 UNESCO designated the same date the International Day of Mathematics. The day already had scientific weight: Albert Einstein was born on March 14, 1879, and Stephen Hawking died on March 14, 2018. The most elaborate observance was on March 14, 2015, when the date written as 3/14/15 at 9:26:53 matched the first ten digits of pi, and was dubbed the Pi Day of the century. Archimedes' bounds of 223/71 and 22/7, from the third century BC, remain the most famous approximations, and pi has now been computed to well over a hundred trillion digits.

How this countdown is calculated

Pi Day is fixed at March 14, so the countdown targets midnight at the start of the next March 14 in your local time zone. Purists mark the moment at 1:59 pm (the next three digits of pi), but the countdown reaches zero at the start of the day.

The big number at the top of this page is computed live in your browser the moment the page loads and ticks down every second — there is no stale, pre-baked figure here. It measures the gap between your current local time and the next March 14, then breaks it into days, hours, minutes, and seconds. Because the math runs on your own device, the result is always correct for your time zone and is never cached out of date.

The Unix timestamp of Pi Day

Beyond the human-friendly countdown, this page also shows the Unix timestamp of the target date — the number of seconds since January 1, 1970 UTC. That single integer is what databases, schedulers, and APIs actually store. If you are building a feature that fires on Pi Day — a banner, an email, a cron job — the timestamp shown above is the value to compare against. You can also drop the date straight into the Epoch Converter to inspect it in every format, or into the Date Duration Calculator to measure the span from any other date.

Ways people use a Pi Day countdown

• Planning — knowing the exact number of days left helps with shopping, travel, and booking before deadlines pass.
• Sharing — send the live countdown link to friends, family, or a team channel so everyone sees the same ticking clock.
• Engineering — use the Unix timestamp above to schedule jobs or gate features around the date.
• Curiosity — sometimes you just want to know "how many days until Pi Day?" and get a precise answer rather than a rough guess.

Want a different date?

This page is part of a small reference of common countdowns and notable timestamps. Browse the full timestamp and countdown hub to find New Year, Christmas, Halloween, the Y2038 deadline, and more — or build a countdown to any moment of your choosing with the Countdown Timer.

Related countdowns

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