Reply To: filter topic on date base

yes it should be as bbpress just uses wp_query once args has been parsed.

see

http://codex.wordpress.org/Class_Reference/WP_Query dates are quite a way down

untested but something like

$week = date( 'W' );
$year = date( 'Y' );
bbp_has_topics( array( 'year' => $year, '&w' => $week ) );

would do last 5 days