[LINK] Apple Asia's Time-Server is >2 minutes fast

[Roger Clarke]

> On 29/08/2019 11:15 am, Roger Clarke wrote:
>> Very strange.
>> By switching to the European server, I got proper time back.
>> Not good if you're running anything that requires notary-level DTS.

On 29/8/19 11:43 am, Bernard Robertson-Dunn wrote:
> If time is that important you should be using NTP/Stratum technology
> https://ntpserver.wordpress.com/2008/09/10/ntp-server-stratum-levels-explained/

Apple has used NTP for decades now.  NTPv3 was 1992, NTPv4 2010.

My strong impression has been that the synch techniques Apple uses are 
good enough for well-under sub-second synch with 'the real time'.

That said:
(1)   the OS 10.4 time-service (current 2005-07) had a serious bug, 
which was never fixed, which meant you had to open the System 
Preferences window in order to force a resynch!
(2)   Apple's Asia time-servers clearly don't keep an eye on one 
another, because otherwise the current problem would never have been 
noticed by a casual user.

-- 
Roger Clarke                            mailto:Roger.Clarke at xamax.com.au
T: +61 2 6288 6916   http://www.xamax.com.au  http://www.rogerclarke.com

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Visiting Professor in the Faculty of Law            University of N.S.W.
Visiting Professor in Computer Science    Australian National University