Re: os.time epoch on Windows

[Louis Mamakos <louie@...>]

If you want to be pedantic, UTC and GMT are not identical, nor is UTC  
derived from GMT.  UTC is an internationally-based time scale, based  
on contributions by multiple national time/frequency standards that  
are based on, e.g., cesium clocks and other intrinsic standards,  
whilst GMT is based on solar time.  When these get out of whack, leap  
seconds are required to keep the time scales roughly aligned.

http://www.apparent-wind.com/gmt-explained.html

If you keep time by looking at your wristwatch, you can probably just  
ignore the difference and dismiss me as a crazy person.  If you notion  
of timekeeping routinely extends into the sub-millisecond regime and  
beyond, well, you worry about this stuff.  I spent a lot of time  
working on an early NTP implementation, and keeping an accurate clock  
is harder than you think.  But that's usually the case with most  
things..

louie


On May 4, 2009, at 12:35 PM, John Hind wrote:

> And -5 hours from Greenwich, UK the true centre (rather than  
> center!) of the
> universe and the datum for UTC. So maybe Windows DOES know about UTC?
>
> -----Original Message-----
> From: lua-bounces@bazar2.conectiva.com.br
> [mailto:lua-bounces@bazar2.conectiva.com.br] On Behalf Of Paul Hudson
> Sent: 04 May 2009 17:17
> To: 'Lua list'
> Subject: RE: os.time epoch on Windows
>
> > > > there's no concept of UTC in windows, so france is -5 hours from
> > > > 'the
> > > > center of the world'  AKA Redmond, WA.
> > >
> > > Redmond and France are 9 hours different, not 5?
> > I live in: Québec, Quebec, Canada
>
> Which is 3 hours different from Redmond.