Integer values for date claims using lcobucci/jwt v4

UnixTimestampDateConversion.php

<?php declare(strict_types=1);

namespace App\JWT\Encoding;

use Lcobucci\JWT\ClaimsFormatter;
use Lcobucci\JWT\Token\RegisteredClaims;

class UnixTimestampDateConversion implements ClaimsFormatter
{
    public function formatClaims(array $claims): array
    {
        foreach (RegisteredClaims::DATE_CLAIMS as $claim) {
            if (! array_key_exists($claim, $claims)) {
                continue;
            }
            $claims[$claim] = $this->convertDate($claims[$claim]);
        }

        return $claims;
    }

    private function convertDate(\DateTimeImmutable $date): int
    {
        return $date->getTimestamp();
    }
}

usage.php

<?php declare(strict_types=1);

namespace App\JWT;

use App\JWT\Encoding\UnixTimestampDateConversion;
use Lcobucci\JWT\Builder;
use Lcobucci\JWT\Configuration;
use Lcobucci\JWT\Encoding\JoseEncoder;

$builder = $config->builder(new UnixTimestampDateConversion());
$builder->expiresAt(new \DateTimeImmutable('+1hour'));