Hi,

The date of the last visit disappeared from the profile of members. This is very useful information in the community.

I need help with this problem.

Hi, Paolo.

This info was deprecated in one of latest version.
The only way to bring it back is custom hack... that is customization of layout.
What you need is to override this file:
ROOT/components/com_community/templates/jomsocial/layouts/profile/focus.php
Please read here about template overrides: documentation.jomsocial.com/wiki/Customizing_Template
It's quite simple for skilled developer. Please, consider to hire one if you can't manage it: www.upwork.com/groups/jomsocial

Snippet bellow will display latest user login date:

<?php echo $my->lastvisitDate; ?>