HTML5 <time> Tag

Explanation:

The <time> tag is used to declare a date and time within an HTML document.

Usage:

<article>
<h1>Article heading</h1>
<p>article published on <time datetime="2010-03-24>March 24th 2010</time></p>
<p>Article content</p>
</article>

Attribute	Description
datetime	Specifies the date or time. Must be a valid date or time string.