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Date:      Wed, 26 May 2004 02:49:18 +0200
From:      Erik Trulsson <ertr1013@student.uu.se>
To:        Daniel O'Connor <doconnor@gsoft.com.au>
Cc:        cvs-all@freebsd.org
Subject:   Re: cvs commit: CVSROOT cfg_local.pm
Message-ID:  <20040526004918.GA66784@falcon.midgard.homeip.net>
In-Reply-To: <1085524237.912.25.camel@inchoate.localdomain>
References:  <200405250904.i4P94pNf016347@repoman.freebsd.org> <BB35B1F9CBFF98B8CE477D7C@andromede.in.reaumur.net> <xzpu0y4uasp.fsf@dwp.des.no> <1085524237.912.25.camel@inchoate.localdomain>

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On Tue, May 25, 2004 at 12:30:37PM -1000, Daniel O'Connor wrote:
> On Mon, 2004-05-24 at 23:16, Dag-Erling Sm=F8rgrav wrote:
> > Mathieu Arnold <mat@FreeBSD.org> writes:
> >=20
> > > +-le 25/05/2004 09:04 +0000, Dag-Erling Smorgrav a dit :
> > > | des         2004/05/25 09:04:51 GMT
> > >
> > > You said it'll be UTC, now, we have GMT ;-)
> >=20
> > Yeah, well :) GMT is UTC plus leap second corrections.  Our UTC time
> > zone is actually called "Etc/UTC", but invalid time zones are treated
> > as GMT, so specifying "UTC" works, for sufficiently fuzzy values of
> > "works".
>=20
> Especially since there don't actually appear to be any leap seconds :)
>=20
> [inchoate 12:30] ~ >env TZ=3DEtc/UTC date ; env TZ=3Dfoo date
> Tue May 25 22:30:10 UTC 2004
> Tue May 25 22:30:10 GMT 2004

UTC and GMT are equivalent.  GMT used to be defined based on
astronomical observations but is now used as a synonym for UTC.
UTC is based on TAI, which is a timescale based on atomic clocks, but with
leap seconds added when appropriate to keep UTC in sync with the
earth's rotation and astronomical observations.

See http://www.faqs.org/faqs/astronomy/faq/part3/section-4.html for
more information on various time standards.


--=20
<Insert your favourite quote here.>
Erik Trulsson
ertr1013@student.uu.se



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