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 <[email protected]> > 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 <[email protected]> > Reply-To: Discussion of precise time and frequency measurement > <[email protected]> > > 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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