Dates within DatePicker `validationErrors` are not correctly localised on server when using a different language about react-spectrum HOT 3 OPEN

Building on this, it looks like the errors do not respect the locale set by the I18nProvider - see:

Note that the locale is set to es-ES, and you can see the DateField has the correct format for the locale (no leading zero), but the error is in English and has the incorrect format (it has a leading zero)

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Those error messages are the browser's built-in validation messages, so they rely on the browser's set language, not the provider's locale. There isn't currently a browser API for customizing this behavior. You can pass in custom error messages as an alternative instead: https://react-spectrum.adobe.com/react-spectrum/forms.html#customizing-error-messages

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Oh that's a shame. Is there a straightforward way to extract the date value from from the error? Or would regex be my only bet? Or should the date have the correct locale format already?

The main problem is the date not using the correct locale (and therefore causing client/server mismatch errors), so if I could easily extract this and format it correctly, then it wouldn't be a big of a concern.

Right now the server/client mismatch is our block.

EDIT: I suppose I could use the minValue/maxValue provided to the component, but this wouldn't give me the original browser-provided error message when using validationDetails to specify it on the validationDetails.rangeOverflow / rangeUnderflow and so I'd have to provide a custom (and therefore may as well translate) message itself

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