linux-kernel - Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009

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Message-ID: <20090107011713.GA27527@mail.local.tull.net>
Date:	Wed, 7 Jan 2009 12:17:13 +1100
From:	Nick Andrew <nick@...k-andrew.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	David Newall <davidn@...idnewall.com>,
	Linas Vepstas <linasvepstas@...il.com>, david@...g.hm,
	Kyle Moffett <kyle@...fetthome.net>,
	Ben Goodger <goodgerster@...il.com>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org,
	"Jeffrey J. Kosowsky" <jeff@...owsky.org>,
	MentalMooMan <slashdot@...eshallam.info>,
	Travis Crump <pretzalz@...hhouse.org>, burdell@...ntheinter.net
Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years	2008-2009

On Tue, Jan 06, 2009 at 09:40:58AM +0000, Alan Cox wrote:
> >        UTC  equivalent  to  conversion  on  the naive basis that leap seconds are ignored and all
> >        years divisible by 4 are leap years.  This value is not the same as the actual  number  of
> >        seconds between the time and the Epoch, because of leap seconds and because clocks are not
> >        required to be synchronized to a standard reference.
> 
> I'm not sure what you are quoting from but it is out of date on the
> subject of leap years.

"man 2 time" on Debian Lenny. The treatment of leap years looks ridiculous, but
within the context of a 32-bit time_t, all divisible-by-4 years between 1901 and
2038 are leap years. It's a bit of a problem for 64-bit time_t though.

Nick.
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