Drupal 8.x

How can use non-Gregorian dates and calendars?

I adjust Drupal setting to my native language (fa) and native location (Asia/Theran) but month name and number of years also in Gregorian yet (however there are translated to my native language-persian).

I already use format_date() or date() in theme files, but this function is not locale-aware, which means that it always outputs English language data, such as day and month names and ordinal number suffixes.

Hi everyone,

If I build my website with Drupal 8, will it be easily to upgrade my website from Drupal 8 to Drupal 9 (when it releases) without rebuilding a new website?

Thanks and best regards,

I'm trying to install Drupal 8 on my server (PHP 5.6).
Copied the file, extracted and when I access the site URL it displays the following error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

I have done numerous installation of Drupal 6 & 7 before and this is the 1st time I have this issue. Even tried different D8 versions.
Followed the requirements on this link: https://www.drupal.org/requirements

I am trying to create my first drupal 8 module. in this module I have to create a new form and provide user a file uploading capability in this form. here is my form controller:

Edit: as a beginner, I misinterpreted the fault.
It's https://www.drupal.org/node/2692373

So short of editing a page or article content and uploading a file (like an image, etc.) within the content, how do you upload a file, pdf jpg txt, etc.

The Files tab, list of files under Content is cool but I assume that is only some kind of View and there's no add-file/upload-file button or other media managing interface?

Is the only way to upload/organize files (without using FTP, other modules, etc.) to create a custom content type and add an upload field to that form? Seems awkward at best.

Thanks