Date.php

<?php
declare(strict_types=1);

namespace Sirius\Validation\Rule;

class Date extends AbstractRule
{
    const OPTION_FORMAT = 'format';

    const MESSAGE = 'This input must be a date having the format {format}';

    const LABELED_MESSAGE = '{label} must be a date having the format {format}';

    protected array $options = [
        'format' => 'Y-m-d'
    ];

    protected array $optionsIndexMap = [
        0 => self::OPTION_FORMAT
    ];

    public function validate(mixed $value, ?string $valueIdentifier = null): bool
    {
        $this->value = $value;
        $this->success = $value == date(
                (string) $this->options['format'],
                $this->getTimestampFromFormatedString($value, $this->options['format'])
            );

        return $this->success;
    }

    protected function getTimestampFromFormatedString(mixed $string, mixed $format): ?int
    {
        $result = date_parse_from_format($format, $string);

        return mktime(
            (int)$result['hour'],
            (int)$result['minute'],
            (int)$result['second'],
            (int)$result['month'],
            (int)$result['day'],
            (int)$result['year']
        ) ?: null;
    }
}