I need to add a date field to the users objects, can anyone help me? This field is only to save the creation date. but I don't know what I've to edit to do that, on the regular folder I've the _edit and the edit_form but for users...
User creation time could be from time to time of interest. Anyway, in LDAP - off-head - I do not know any schema dealing explicit with it. There is shadow which deals with last password change and user expiration.
Overall one could read the OpenLDAP createTimestamp or the AD whenCreated field, but I fear this may change on export/import (needs verification).
Other auth method will not provide this (maybe LDAP but for sure stuff like pas.plugins.authomatic) but in those cases users are created externally so it's OK imho that this feature is not supported.
Instead Plone could implement this.
A recent usecase: a customer leaved the join form open without capcha and this time it was not simple to get which users where fake or not. BOT attacked all night long, having creation date was an important missing information that time!