pytz question: GMT vs. UTC

[Roy Smith]

In article <52eb287c$0$29972$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> On Fri, 31 Jan 2014 04:08:46 +0000, Dan Sommers wrote about temperatures:
> 
> > And -1 K.
> 
> 
> You josh, but there are negative temperatures in Kelvin. They're hotter 
> than infinitely hot.
> 
> http://en.wikipedia.org/wiki/Negative_temperature

Negative Kelvins also have meaning as relative measurements.  "The 
framzit is changing temperature at a rate of -3.6 K per gigafortnight"