- Mar 2, 2012
USA standard format is MM/DD/YYYY. Previous companies I’ve worked at have adopted an unambiguous format – 26Aug2019 – for recordkeeping, e.g., lab notebooks. One significant problem with that, as well as with both the US and international formats, is that they don’t sort chronologically (e.g. file names). YYYYMMDD is useful for that reason.
I’ve never seen a standard for the country enumerated (nor have I looked for one). In my professional life I use, among others, ASME and ISO standards. Y14.100 and 8601* both require YYYYMMDD. I also adopted that format many years ago for the reason you cite (sorting).
*ISO allows various other formats, such as YYYYDDD, YYWwwD, but the complete representation is as the aforementioned.