Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Parse about any English textual datetime description into a Unix timestamp
<?php strtotime(string $datetime, ?int $baseTimestamp = null): int|false
<?php     static private function cachedFileResponse($filename, $contentType, $lastModified, $downloadCallback)

    {

        $expires = strtotime('+1 year');

        $cacheControl = 'public, max-age=31536000';



        if (static::matchesCache($lastModified)) {
<?php     {

        $ifModifiedSince = app(Request::class)->header('if-modified-since');



        return $ifModifiedSince !== null && @strtotime($ifModifiedSince) === $lastModified;

    }



    static function httpDate($timestamp)