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

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Date:	Mon, 05 Jan 2009 17:04:10 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Ben Goodger <goodgerster@...il.com>
CC:	david@...g.hm, Kyle Moffett <kyle@...fetthome.net>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org, linasvepstas@...il.com,
	"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

Ben Goodger wrote:
> 2009/1/5 David Newall <davidn@...idnewall.com>:
>   
>>> another poster said that NTP packets include information about this
>>> month's leap second, so that implies that they could change monthly.
>>>       
>> Not "could change monthly" rather, "could change at any month".
>>
>> The frequency of zoneinfo updates would therefore be: every time the
>> zones you care about change; and every time there's a leap second.  No
>> big effort.
>>     
>
> Unfortunately, as has been pointed out, timezones are completely
> unrelated to leap seconds.
>   

Zoneinfo files cater for leap seconds.

> NB. Leap seconds, positive or negative, potentially occur every six
> months (June 30 or Dec 31), but since their introduction this
> frequency has happened only once (in 1972); historically they have
> been inserted on average every 1.5 years, but there have been only two
> since 2000.

If you know in advance, you can update zoneinfo files with multiple leap
seconds.
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