This question has been answered by BobRay. See the first response.
Ok it turns out that the register date is not set at all! That's a bit surprising to me. Actually BobRay told me that a long time ago, but I forgot about it.
<div class="f1-f2">[[%discuss.date_registered]]: </div> <div class="f3-f5">[[+createdon:strtotime:date=`%b %d, %Y`]]</div>
Discuss extends the modUser object and adds some extra fields. That field is, in fact, called 'createdon', but you won't get it with the standard created on tag (which gets the Resource createdon field).
You might try this snippet and see if you get anything:
$userId = 12; // set this to the ID of a registered Discuss User $usr = $modx->getObject('disUser', array('user' => $userId)); if ($usr) { return $usr->get('createdon'); } else { return 'User Not Found'; }
The Discuss schema is kind of funky (and you have to go to GitHub to see it), so I'm not sure if this is right.
[[+createdon]] [[+confirmedon]]