propel join with additional condition on a date

gistfile1.txt

// also tried using addJoinObject + addJoinCondition but either way the condition just gets ignored
$results = $this->getFooQuery()
    ->addJoin(
        FooTableMap::COL_ID,
        BarTableMap::COL_ITEM_ID,
        Criteria::LEFT_JOIN
     )
     ->addCond(BarTableMap::COL_UPDATED_AT, $updatedAt->format('Y-m-d H:i:s'), Criteria::LESS_THAN)
     ->toString()
;

Source: http://propelorm.org/blog/2010/02/16/propel-query-by-example.html

/*

• Retrieving articles authored by someone
  */
  // Propel 1.4
  $c = new Criteria();
  $c->addJoin(ArticlePeer::AUTHOR_ID, AuthorPeer::ID);
  $c->add(AuthorPeer::NAME, 'John Doe');
  $articles = ArticlePeer::doSelect($c);
  // Propel 1.5
  $articles = ArticleQuery::create()
  ->useAuthorQuery()
  ->filterByName('John Doe')
  ->endUse()
  ->find()