[jQuery] tablesorter plugin - could be a bug

[jQuery] tablesorter plugin - could be a bug

Hi guys.
I'm testing tablesorter(<a href="http://www.tablesorter.com">www.tablesorter.com</a>) plugin to work in a huge table. Tablesorter is a nice tool. But may be I don't know how to sort date column properly. Please look this link
<b><a href="http://tinyurl.com/33rw7p">http://tinyurl.com/33rw7p</a></b>
First column could be sortable but I don't how to do that. Could be a bug?
Cheers