Yes. ISO chooses year-month-day, which puts largest component first and smallest last. This has the nice benefit that treating it as a string and doing alphanumerical sort matches the actual day sort. Ref. https://en.wikipedia.org/wiki/ISO_8601
The main benefit of Y-M-D, is that no-one uses Y-D-M, and the 'Y' component is easily recognisable. So if you use Y-M-D, then everyone knows it's Y-M-D and there is no ambiguity.
My two favourite date formats are: (1) yyyy-MMM-dd and (2): yyyyMMdd.
Why?
(1) eliminates any ambiguity regarding interpretation. You can have an instance of a server of an unknown provenience and/or regional settings and still count on yyyy-MMM-dd to be correctly recognized.
(2) on the other hand has a nice feature of being sortable and can also be stored as an integer value if needed.
The US standard of MM/dd/yyyy is ridiculous. But it's just one of many and I'm not going to fix the world ;)
On the main topic: if anyone needs to calculate the circumference of the Universe (radius: 50bn lightyears ish) with the accuracy of the Planck distance (approximately 1.6 x 10^-30 meters), they need less than 65 digits of Pi to do so. So, as already stated, it's just a PR stunt, nothing more.