[LEAPSECS] Fwd: [time-nuts] Mac OS and iOS leap second handling

[Eric Scace]

   The list admin reminded me that this email community would likely be a better audience for my questions below.

   Thank you in advance for sharing any current documents, tests, or practical advice.

— Eric

> Begin forwarded message:
> 
> From: Eric Scace <eric at scace.org>
> Subject: [time-nuts] Mac OS and iOS leap second handling
> Date: 2019 Oct 22 Tue at 18:28:22 EDT
> To: Time Nuts email list <time-nuts at lists.febo.com>
> Reply-To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
> 
>   Maybe someone on the list has a recent and authoritative answer to the following questions.
> 
>   I’ve been digging around in “civilian mode” (not an OS X or iOS developer) trying to determine if current Mac OS X and iOS releases handle leap seconds:
> no smearing
> proper display of 23:59:60, etc on the system clock & return of same to appropriate function calls.
> 
>   I have not been able to discover a well-documented answer to this question; e.g., video of an OS X/iOS system clock displaying a leap second, or Apple-sourced documentation stating leap second support.
> 
>   There are assertions that OS X was built around POSIX and suffers from the limitations of Unix epoch time decisions of long ago. Is that still the case?
> 
>   (In contrast, Microsoft docs claim Win 2018 Oct and Win Server 2019 now have leap second support.)
> 
> Thanks,
>   — Eric
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