phpseclib enableDatePreservation not preserving date

Maybe somebody out here may have encountered this issue before. I am using phpseclib version 3.

My code is basically uploading a file via SFTP to another server. The connection part is good, and the upload also pushes through.

However, I need to maintain the date modified for the uploaded file. Currently the files uploaded get the time they are uploaded as the date modified.

require_once __DIR__ . '/vendor/autoload.php';
use phpseclib3\Net\SFTP;

$server = "xxx.com";
$username = "xxxx";
$password = "xxxxxx";

$sftp = new SFTP($server);
$sftp->enableDatePreservation();

if($sftp->login($username, $password)){

$test1 = $sftp->put("public_html/Content/". basename($filename), $filename, SFTP::SOURCE_LOCAL_FILE);

if ($test1) { echo "upload ok"; } else { echo "not ok"; }

Note that this is just rough code, just proof of concept at this point. Just trying to get the file modified date/time to transfer over. I also tried adding the enableDatePreservation AFTER the $sftp-put. I also tried uploading to different servers, just in case it is a user permission problem. same result.

Hopefully someone out there has some insights! Thanks a lot!

source https://stackoverflow.com/questions/67926723/phpseclib-enabledatepreservation-not-preserving-date