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Windows 7: This year's Y2K: 'Leap second' threatens to break the Internet

20 Jan 2015   #21
Slartybart

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem
 
 

Quote   Quote: Originally Posted by groze View Post
.....
What happens if the IERS network time servers goes down? Does Unix crash?
That would be the end of time, much worse than Unix crashing.


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20 Jan 2015   #22
Lady Fitzgerald

Win 7 Ultimate 64 bit
 
 

Quote   Quote: Originally Posted by Kari View Post
...You are not often right but this time you are wrong ...
Sorry but that tickled my funny bone for some reason.
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20 Jan 2015   #23
jimbo45

Linux CENTOS 7 / various Windows OS'es and servers
 
 

Hi there

A little bit of History -- back in 1582 the Gegorian Calendar (current one) was introduced in some European countries before it was universally adopted (Turkey actually being the last country which didn't adopt it until 1927 !!). The old Julian calendar which preceded it was getting dangerously out of Sync -- mid summer would noticeably appear at the wrong time, navigation charts would become increasingly inaccurate etc. (Longitude calculations etc) so obviously the calendar needed to be corrected.

France was the first together with Italy, Portugal and Spain where 10 days were removed. Germany in 1610 also by removing 10 days flowed by the UK, Canada, USA in 1752 where 11 days were removed.

People went rioting in the streets thinking they'd been robbed of 11 days of life. !!!

Judging by some of the comments on this thread it would appear people are STILL of the same mind set !!!!.

Cheers
jimbo
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20 Jan 2015   #24
Kari

Microsoft Community Contributor Award Recipient

 

Quote   Quote: Originally Posted by Lady Fitzgerald View Post
Quote   Quote: Originally Posted by Kari View Post
...You are not often right but this time you are wrong ...
Sorry but that tickled my funny bone for some reason.
At least someone understood it.
My System SpecsSystem Spec
20 Jan 2015   #25
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

This is a good read to get a primer on the Network Time Protocol and why leap seconds matter to the internet:

Network Time Protocol - Wikipedia, the free encyclopedia

Further down in the article you should note that servers adhering to the NTP should already be able to handle a leap second.
It looks like devices using time stamp protocols other than NTP could be affected.
My System SpecsSystem Spec
20 Jan 2015   #26
Slartybart

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem
 
 

Quote   Quote: Originally Posted by TVeblen View Post
This is a good read to get a primer on the Network Time Protocol and why leap seconds matter to the internet:
Network Time Protocol - Wikipedia
.....
From the wiki page TVeblen linked:
Quote   Quote: Originally Posted by wikipedia
Leap seconds
... Because of the requirement that time must appear to be monotonically increasing,
a leap second is inserted with the sequence: 23:59:59, 23:59:60, 00:00:00
Although the clock is actually halted during the event, any processes that query the system time cause it to increase by a tiny amount, preserving the order of events. If it should ever become necessary, a leap second would be deleted by skipping 23:59:59
There seems to be a few solutions to this already available for the server side of things.

System programs are probably hardened by now, application programs, maybe not so much.

There's a lot of old software out that that is being maintained by one person. This might be a consultant who only supports the software when there is an issue.

How did (do?) some programs determine the passage of a day? Magic!

The magic number 1440 to be exact. That's all there was, no more than 1440.
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20 Jan 2015   #27
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Or 86,400 !
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20 Jan 2015   #28
Kari

Microsoft Community Contributor Award Recipient

 

Quote   Quote: Originally Posted by Slartybart View Post
The magic number 1440 to be exact. That's all there was, no more than 1440.
Quote   Quote: Originally Posted by TVeblen View Post
Or 86,400 !
I was also wondering that about 1,440, number of minutes in a day. If we are talking about seconds per day that's of course 86,400.
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20 Jan 2015   #29
Indianatone

Windows 7 x64 Ultimate and numerous virtual machines
 
 

It is fascinating that we have the technology to measure time so accurately that we can tell the Earth's rotation varies. That is really something. Kari you have to forgive grove. He is a Hoosier from Indiana which until recently did not do DST and parts near Chicago and the Far South West around Evansville are on Central time. The rest of the State is on Eastern time with DST. Before the state did DST the counties in several areas ignored the general time and followed DST. This happened around Louisville Kentucky those counties followed Louisville time so the TV schedules were correct. Some of the Northern counties did some weird things too even though they were not supposed to. That is why it is so confusing to Indiana natives until recently where we now seem to have the best plan. However some want to put the state on Central time which may lead to more problems such as darker evenings in Winter and early sunset in Summer.
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20 Jan 2015   #30
Slartybart

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem
 
 

Quote   Quote: Originally Posted by TVeblen View Post
Or 86,400 !
Thanks for doing the math TVeblen
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 This year's Y2K: 'Leap second' threatens to break the Internet




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