Manual:FixUserRegistration.php/en

Details
fixUserRegistration.php file is a maintenance script to fix the  field. Old user accounts have the  field set to "NULL". This script searches for those users who are affected, and inserts the timestamp from their first edit as an estimation for the registration time into the  field.

This script process 1000 items in a batch.

Options/Arguments
This script does not take any options or arguments.