ParentFull threadem500·YYYY-MM-DD is ISO8601 extended format, YYYYMMDD is ISO8601 basic format (section 5.2.1.1 of ISO8601:2000(E)[1]). Both are fully according to spec, and neither format takes precedence over the other.[1] https://www.pvv.org/~nsaa/8601v2000.pdfView on HN