[Plugin: Display Posts Shortcode] date is not showing

Hey there, I’m using your plugin and I’m having a little problem.. The date is not showing, I switched to Twenty eleven template and nothing.
I’m using this shortcode [display-posts posts_per_page="6" include_date="true"].

Can you tell me wht I’m missing?

http://ww.wp.xz.cn/extend/plugins/display-posts-shortcode/

and this is the website I’m working on:
http://www.lauriegardner.com/words-of-wisdom/