Hi,
All files and their data are in the [Developper mode activated] 
→ settings > Technical > Attachements > open a file and you have the create date visible there.

I just verified and the files has a date field you can place on the list view (attachements)

Hello Udo,

  To retain and display the original file date of documents imported into Odoo, you might need to customize your import process. Odoo, by default, does not store the original file creation or modification date in the database for attachments. However, you can achieve this by following these steps:

  1. Create a custom module or extend an existing one to add a new field for storing the original file date.

  2. Override the create method for attachments in your custom module to capture and store the original file's date. You can use Python's os.path.getmtime() or os.path.getctime() to get the modification or creation time of the file before it's uploaded to Odoo.

  3. Modify the view to display the original file date alongside the attachment. This might involve adjusting the form view of the model where you're attaching the file.

For personalized assistance:
https://www.pragtech.co.in/contact-us-mql.html