Trial period

Hello,
I would like to set up by default on registration a trial period for new subscribers.
What I though to do is :
-create a new "EXPIRATION-DATE" field visible but not editable by user both on registration and profile-edit where the value should be calculated in XX days after current registraton day. The day after expiration-date the user should be automatically disabled.

How would you set it up correctly since I do not see in a date field parameters a field to set up a preconfigured value on registration ?

Thanks in advance for help.

You'll have to use CB Auto Actions for that and its Format Functions. You'll need to act on the after user registration trigger with a Field action. Next under Parameters set Format Functions to Yes. Now under Action tab set the following.

Field: YOUR_DATETIME_FIELD
Operator: Set
Value: Translate Value: No

The above should add 7 days to their registration date and set it as the value of your datetime field. You can change how many days it adds by adjusting "+7 DAY". See the below on supported values as it's just using strtotime basically.

php.net/manual/en/datetime.formats.relative.php