Is there a standardized (meta?) tag for the date of a website?

Question

One thing that search engines really suck with is the date when a website was created. You know the problem: You search for some CSS or JavaScript problem and Google returns

Answer 1

For marking content, you can go the HTML5 route of microdata.

I'm struggling with the same question - google can figure out dates on some content on my site, but not others. I want to help it, so it can always get the date on the article.

I'm trying a combination of the "dc.date" metatag suggested above, and marking up the timestamp that appears on the page using microdata.

Google's example of how to mark up your timestamps using microdata is:

15 October 2009, 7PM