On 7 Jan 2011, at 00:28, Poul-Henning Kamp wrote:

In message <[email protected]>, Nero Imhard writes:

Each year should have at least two [...]

Have you considered that in asia one of them is likely to happen during
the business day ?

Summer Time shifts happen at 2am (or thereabouts) local, so that there are windows when the delta between adjacent timezones, even those following equivalent summer time rules, change. The world still turns.

When the leap second is applied is irrelevant for 24x7 operations. So the issue you raise only affects daytime only shops. What stops leap seconds being applied at local 2am? Are there really non 24x7 processes where a 1s offset from UTC for less than one day, with the clock remaining monotonic, are an issue? People who get their leap seconds by slewing the clock to match NTP or a local reference don't care, only people who step their clock in response to a lead second announcement, so who are these people?

ian
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