Add post date to the post_html attribute

How do I add the post date to the post_html attribute in the shortcode? I tried using the stats_date=1 attribute, however that does not seem to work. Is there a tag similar to {date} that I can add to the post_html attribute?

My Code:
[wpp range=weekly order_by=views wpp_start=<ul> wpp_end=</ul> post_type=post post_html="<li><a href='{url}'><span style='color:#000000'>{text_title}</span></a></li><br /><br />"]

My Website:
http://www.collin-barrett.com

http://wordpress.org/plugins/wordpress-popular-posts/