Upcoming Leap Second Windows Mitigation

Hail to all professionals,

With a second leap looming up ahead in June 30, and according to Microsoft KB909614:
After the leap second occurs, the NTP client that is running Windows Time service is one second faster than the actual time. This time difference is resolved at the next time synchronization.


Are there any measures to take to ensure that our Windows clients not caught by this blight and in the act avoid any service disruption to our applications ?
Hani_SAAsked:
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David Johnson, CD, MVPOwnerCommented:
The windows time service doesn't guarantee resolution < 5 minutes. and the file system used to use a granularity of 2 seconds.  the only thing that I can see happening is that a scheduled task that is set to run at midnight may run 2x but only if the time synchronization is executed at 00:00:01.. Leap seconds are not normally an item of concern
David Johnson, CD, MVPOwnerCommented:
The windows time service doesn't guarantee resolution < 5 minutes. and the file system used to use a granularity of 2 seconds.  the only thing that I can see happening is that a scheduled task that is set to run at midnight may run 2x but only if the time synchronization is executed at 00:00:01.. Leap seconds are not normally an item of concern.  Google has a work around using a time-smear where they gradually change the time and you can use their time servers
time1.google.com
time2.google.com
time3.google.com
time4.google.com
Hani_SAAuthor Commented:
Actually we sync from our own server client wherein NTP clients perform sync once a day from ROOT/DC, do you propose doing an urgent sync that day ?
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David Johnson, CD, MVPOwnerCommented:
For most applications the 1 second or the 23:59:60 or the 0:0:0 and then the repeated 0:0:0 isn't a problem.
Hani_SAAuthor Commented:
so no need to an immediate sync after June 30 23:59:60 right?
David Johnson, CD, MVPOwnerCommented:
1 second is immaterial for windows but may be important for real time operations i.e. money transfer. As I mentioned you could use Google's time services and your time will be slowly retarded until jun 30th 23:59 where it will be 1 second slow and then right on time at 00:00 1 July.  1 Second is well within the Kerberos  time difference

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frankhelkCommented:
The classic NTP client (of which Windows ports exist) deals well with leap seconds. There's a good intro about that here and some more info here (from that page you might wander around following links to even more details).

I don't know if the crappy W32time implements that all (in fact, I bet that it doesn't) ... so migrating to the classic NTP client might be worth to consider.

You might have a look at my article on NTP, too ...
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