What is the easiest way to change user registration dates?


I switched from vBulletin to Discourse but i wasnt able to migrate the user registration dates. I would like to restore them for some users manually now. What would be the easiest way to do so?

I am noob with ruby and docker so i dont know how to edit the database via shell. I know how to use phppgadmin but i dont know how to install it on a configuration without LAMP.

Please help!