Messages in this thread | | | Date | Mon, 05 Jan 2009 17:04:10 +1030 | From | David Newall <> | Subject | Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009 |
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Ben Goodger wrote: > 2009/1/5 David Newall <davidn@davidnewall.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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