如何将日期字段更改为pt-BR

I need to change Date Field to pt-BR

Not do anything because in the documentation don't have examples for this

this -> https://github.com/laravel/nova-issues/issues/343#issuecomment-457953132 solved my question

Just add the next to bottom file resources/views/vendor/nova/layout.blade.php:

<!-- Change language default -->
<script src="https://npmcdn.com/flatpickr@4.5.2/dist/l10n/es.js"></script>
<script>
    flatpickr.localize(flatpickr.l10ns.es)
    flatpickr('.flatpickr-input')
</script>

NOTE: If you even haven't the file resources/views/vendor/nova/layout.blade.php you need copy it from nova/resources/views/layout.blade.php

Do ou wanna to change data value from where? Database? In model just use this (in this exemple i change the created_at)

public function getCreatedAtAttribute($value){
        return Carbon::parse($value)->format('d/m/Y h:i:s');
}

Look for mutators in docs.