Hi Terrance, You said:
> Package: coreutils > Version: 9.7-3 > > > date command uses a comma ',' as the decimal point for `date --iso-8601=ns` > output, causing parsing issues. but --rfc-3339 uses a dot '.' . > > console: '%' is command prompt > > ``` > % date --iso-8601=ns > 2025-10-25T15:21:22,840959700-07:00 > % date --rfc-3339=ns > 2025-10-25 15:21:40.295367270-07:00 > ``` > > > I read ISO8601 and RFC3339 and found no definition of decimal fraction of > second. But should `date` command print the fraction number using locale > format? My understanding is that the 2019 edition of ISO 8601 explicitly states that a comma or period can be used [1]. It is difficult to get an exact quote on that since it is a paid standard. :( I see that we have a similar bug report upstream where Paul Eggert came to the same conclusion [2]. Collin [1] https://en.wikipedia.org/wiki/ISO_8601#Times [2] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63119
