But the webdev has to solve this problem. Users with wrong locales and not aware of that are not very uncommon. I would also love the US to fix their stupid date format and even fully adopt the metric standard but sometimes you have to compromise and write code instead.
WRT dates, there's no "metric" standard. Not really. E.g. Belgium commonly uses DD/MM/YYYY whereas the Netherlands uses DD-MM-YYYY. Both use "metric standard" for lengths, weights etc. Same with currencies: "13,37 €" vs "€ 13,37" vs
"€13,37", all depending on where in Belgium you are from, vs Dutch in the Netherlands. It's an utter mess.
Which is another reason to let browsers - the user agents - deal with this. There's absolutely no way a lonely JS dev, or even a community around something like MUI to get all this right. And they don't. There's always something broken for me with these custom elements. If it's not some US-centric web-app enforcing their MM/DD/YYYY format, then it's some "ignorant" dev being unaware that in Europe in many countries decimal separators are a comma, or that in Thailand the current year is 2566 and that this is not "too far in the future".
