22
Wow! It actually makes sense!
(i.imgur.com)
Professionals have standards! Community for all proponents, defenders and junkies of the Metric (International) system, the ISO standards (including ISO 8601) and other ways of standardization or regulation!
If the date format is not YYYY-MM-DD it can fuck right off.
ISO 8601. Unironically the only ISO number I also remember.
I also remember as PHP programming language still won't do it with this function: DateTimeInterface::ISO8601 DATE_ISO8601 https://www.php.net/manual/en/class.datetimeinterface.php#datetime.constants.iso8601
You need the DateTimeInterface::ISO8601_EXPANDED which can actually accept non compliant strings too.
PHP - wherever you see an intuitive solution it's wrong or has important caveats.