Luckily, we have decades of experience in e.g. SQL, and existing and well-polished ISO specs on dates that can just be used as is without reinventing the wheel.
Yeah, but OmegaStar still doesn't support ISO timestamps like they said they would a month ago!
(Reference: https://youtu.be/y8OnoxKotPQ)
As if anyone actually implements ISO 8901 correctly.
JavaScript certainly doesn't.