从Unix时间戳到PHP年月日的转换

Question

We are in the process of moving our domain to a new dedicated server we recently purchased. The new server's time zone is causing some issues with our attachments php code.

Our forum software uses the following folder structure to store attachments:

/public_html/forum/files/2016/February/14/[Filename]

The year, month and day are obtained from the File Upload Time Stamp which is a Unix Timestamp such as "1455426488". This timestamp is then converted to year, month and day using the following php code:

$date = getdate((int)$attachment['filetime']);
$filepath = $config['upload_path'] . '/' . (string)$date['year'] . '/' . $date['month'] . '/' . (string)$date['mday'];

This worked fine on our old server and the server before it, but on the new server the "day" is either 1 day behind or one day ahead when converted, which causes "February 14" file uploads to either end up in "February 13" folder or "February 15". Keep in mind that file Upload time of 1455426488 in unix timestamp is 02/14/2016 at 5:08am UTC Timezone.

Does anyone have any suggestions on how to fix this issue? This is a critical part of our forum system, so without coming up with a solution for it we won't be able to migrate to the new server.

Thanks,

Pete

BTW, both the old and the new server are using the "America/Chicago" as their timezone (CST).

Answer 1

You can use the DateTime class in order to convert your dates.

$date = new DateTime(null, new DateTimeZone('America/Chicago'));
$date->setTimeStamp((int)$attachment['filetime']);
$filepath = $config['upload_path'] . '/' . $date->format('Y') . '/' . $date->format('F') . '/' . $date->format('d');

Answer 2

I found the problem! It looks like the following line had found it's way into the download/file.php file:

date_default_timezone_set('GMT');

This line did not exist in the original file, so removing it resolved the issue! I am still not sure how this line got added, but it explains the weird behavior.

Thanks, Pete