π Happy ordinal pi day! (314th day of the year)

No, it should not be the US-centric March 14th, which most of the world writes as 14/3 or 14-3.

Science and mathematics are international, without borders, not specific to any one country or culture. As scientists and mathematicians we should seek international-based celebrations that bring us all together around the globe rather than country-specific dates.

The ordinal date (ISO 8601) is the only way to have an international nth day of the year: https://en.wikipedia.org/wiki/Ordinal_date

Similarly:

* 88th day: worldwide Piano Day: https://en.wikipedia.org/wiki/Piano_Day (blogged https://tantek.com/2024/088/t1/world-piano-day-ordinal-date-iso-8601)
* 256the day: 8-bit day or https://en.wikipedia.org/wiki/Programmer%27s_Day (blogged https://tantek.com/2025/257/t1/happy-8bitday-255-bytes-max)

I suspect there are other such annual worldwide holidays that are pinned to the ordinal date rather than a Gregorian or other non-decimal calendar. Let me know if you have a favorite that you celebrate!

🥧 I haven't made a pie (or picked one up) yet — will have go pick up a slice during a break in this evening’s #w3cTPAC meetings (which are in Japan where it’s already the day after pi day).

Previously:
* https://tantek.com/2022/314/t1/happy-ordinal-pi-day

#piDay #actualPiDay #ordinalDate #ISO8601 #ISOdate