user_relationships_load has a more flexible query system
arguments will process operators now using the syntax: array(col => '> {value}').
example: show all relationships created in 2007
$start_time = mktime(0,0,0,0,0,2007);
$end_time = mktime(0,0,0,0,0,2008);
user_relationships_load(array('created_at' => ">= {$start_time}", 'created_at' => '< {$end_time'}));