XF 1.5 Add registration date to template online_list

[rike-online]

Hello,

I would like to see the registration date of the users in the "who-is-online-list" (Template online_list), including a check of the authorization whether the corresponding user group is allowed to see this data.

The registration date should be in a separate line between the user name/town and the number of posts:

Administrator, male, from Vancouver
Date of registration: 01.01.1980
Contributions: 996, Approvals: 10, Points for success: 20
View the list of current visitors, 2 minutes ago

Would be great if you could give me the corresponding code in the template online_list and where to edit...

Thanks!
rike