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The Impact of Negative Leap Seconds: Risks and Challenges for IT Systems
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[QUOTE="pbuk, post: 6661033, member: 385977"] And it is naive views like that that cause the problems. Many of these problems stem from the fact that most operating systems (and posix systems in particular) do not store time as minutes and seconds, they store time as the notional number of seconds since some arbitrary point in time. For reasons which quickly become obvious, this notional clock is not adjusted for leap seconds so that for instance noon on 1 Jul 2015 is exactly 86,400 seconds after 30 Jun 2015. And 2015-07-01T00:00:01 (stored as 1435708830) is exactly 2 seconds after 2015-06-30T23:59:59. But because a leap second was declared in that interval, all the clocks on the machine have to fit 3 seconds into that 2 second period - or perhaps in some other period when their NTP daemon catches up. This means (among other things) that an event (such as a file modification) that is recorded as happening at 2015-06-30T23:59:59 may have happened after an event recorded at 2015-07-01T00:00:00. [/QUOTE]
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The Impact of Negative Leap Seconds: Risks and Challenges for IT Systems
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