[Plugin: Quote Of The day] The day should start at midnight, the hour at 0 minutes

The day should start at midnight, the hour at 0 minutes.
After changing the interval, the starttime must be reset.

This code modification in cd-qotd-admin.php does it. (See comments)

switch ($op) {
	case "qotd":
		if ($_POST['action'] == "setqotd") {
			update_option('cd_qotd_type', $wpdb->escape($_POST['cd_qotd_type']));
			update_option('cd_qotd_freq', $wpdb->escape($_POST['cd_qotd_freq']));
			if ($_POST['cd_qotd_freq'] == '2') $cd_qotd_time = mktime(date("H"),0,0);	/* Added to make the hour start at zero minutes */
			else $cd_qotd_time = mktime(0,0,0);				/* Added to make the day start at midnight */
				update_option('cd_qotd_time', $cd_qotd_time);				/* Added to save the resetted starttime */

http://wordpress.org/extend/plugins/cd-qotd/