Ok, I see now. These are 2 different dates. The date that’s being displayed in DA metabox and on the frontend is the date the file was added to attachments to download for a given post.
The date you’d like to get is the date the file was uploaded to WP media library.
You’d have to use the following filter hook to modify that: da_get_download_attachments. It has a couple of attributes available: $files, $post_id, $args. You have to hook into that, generate a loop and modify “attachment_date” key for each of the attached files using WP get_the date function https://codex.wordpress.org/Function_Reference/get_the_date