We now have a handy <time> tag in HTML5. There are numerous examples of its use here & here, with one from me:
The end is <time datetime="2012-12-21">nigh</time>!
So where is the corresponding (to me anyway) and much more useful <place> tag? For fun, let's design one now:
Here is the <place position="90.0;0.0;WGS84">end of the world</place>!
Now that wasn't too hard was it?
Here's another one — a currency value:
The approximate cost of hosting this blog this year is <currency amount="10.00;GBP;2015">£10</currency> per annum.
Thinking about it, the <time> tag is the least useful of the three above, but maybe that's just a cognitive bias.