date() expects at least 1 parameter, 0 given

File: /mnt/pc-www/dod/manage/functions.session.class.php (162) Error 2

158		$life2 = 60*60*24*60;
159		$this->activity .= "<p>Garbage collecting, deleting everything sessions over $life and $life2 seconds old</p>";
160		switch(SESSION_DIR){
161			case 'MYSQL':
162				$sql = 'DELETE FROM session WHERE expires<' . (int)date();
163				dbQuery($sql);
164				// $sql = 'DELETE FROM session WHERE expires<' . (int)(date() + $life2) . ' AND type="subscriber"';
165				// dbQuery($sql);
166				break;
167			default: