Github API: How to get watcher timestamp?

Hi,

I need to fetch the timestamp of a watcher instance from a repository.

I found that I can do this with the following link:

Example:

https://api.github.com/repos/django/django/subscription

However, ERROR 404 is occurring, I don’t know what to do.

There is also the link:

https://api.github.com/repos/django/django/subscribers

however, there is no timestamp in it.

Source: Activity - GitHub Docs