[LEAPSECS] Google, Amazon, now Microsoft

Brooks Harris brooks at edlmax.com
Sun May 31 03:57:03 EDT 2015

On 2015-05-31 02:41 AM, Poul-Henning Kamp wrote:
> --------
> In message <556A6BD2.50608 at edlmax.com>, Brooks Harris writes:
>> I can't find any authoritative announcement or statement to this effect
> >from Microsoft, [...]
> Please note that this is *only* about Microsofts Azure cloud service,
Yes, that's what that articles says, but what does Microsoft say?
> (which according to rumours are mostly used to run Exchange servers).
Indeed, rumors. What does Microsoft say?
> This is *NOT* how your private/work Windows machine will behave,
Well, that's my question. Sure, a single machine catches up when it 
synchronizes to NTP. But what is Windows doing with the Leap Second 
count in each timezone?

The article I referenced earlier said "Applies To:" various Windows 
Server versions - it doesn't mention Vista, Win 7, Win 8, etc.

How the Windows Time Service Works

So, the timing mechanisms are complex, depending on Windows version, 
hardware, and administration choices.

My question is, if Azure is doing this, what is Windows itself doing?

> for that no new information is available and the most recent
> guidance was that "somewhere between a second and an hour later
> the clock will step a second".
"most recent guidance" from whom?

As I understand it, the clock would step a second when it syncs with 
NTP, but note there are apparently different capability NTP clients in 
various Windows versions. But what happens in different timezones?



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