On Sun, 1 Jan 2017 22:02:30 -0700, Jack J. Woehr wrote:
>
>> We have empirical proof of that at one of my clients . Took down a 
>> monitoring system this evening.
>
>And we were not alone: 
>https://blog.cloudflare.com/how-and-why-the-leap-second-affected-cloudflare-dns/
> 
I read the article.  The system involved duplicated the second at 23:59:59
so a time reading late in the first occurrence subtracted from a reading
early in the second occurrence produced a negative elapsed time.  A
validity check failed and triggered a shutdown.

That coudn't happen on z/OS which (almost entirely) shuts down for the
duration of the leap second so time values are bound to appear monotonic.

Did it happen on z/OS?

-- gil

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