Also, the US military used/uses DDMMMYYYY format, i.e., 15JAN2025, where MMM is the month abbreviation, which is similar to one of the formats used in Romania. This has the benefits of unambiguous parsing and no need for component separators but lacks lexicographical sort-ability like ISO 8601. A format like YYYYMMMDD might some of the advantages of ISO 8601 by keeping items of the same year and month together at a minimum. (ISO 8601 is the most proper date format though. ;)