REMINDER: Leap Second

Sun Jan 25 21:17:33 UTC 2015

I spoke on time hacking and ntp 3 years ago at shmoocon.
On Jan 25, 2015 12:28 PM, "Ken Chase" <math at sizone.org> wrote:

> I think devices would likely be fine, unless they're concerned with
> reconciling
> a leap-second updated ntp source and one that's not. Who wins?
>
> For most NTPs I would guess they're slaves to whatever feed and just
> 'believe'
> whatever they're told. (Sounds like a security hole waiting for high
> frequency
> trader types, q.v.
>
> http://www.theverge.com/2013/10/3/4798542/whats-faster-than-a-light-speed-trade-inside-the-sketchy-world-of
> )
>
> Can't we just subscribe to a leapsmeary NTP feed if we care to have no
> big leap (I dont mind)? Isnt NIST offering this?
>
> /kc
>
>
> On Sun, Jan 25, 2015 at 06:01:40PM +0100, Karsten Elfenbein said:
>   >Hi,
>   >
>   >Java had some issues with 100% CPU usage when NTP was running during
>   >the additional second in 2012.
>   >
> http://blog.wpkg.org/2012/07/01/java-leap-second-bug-30-june-1-july-2012-fix/
>   >
>   >Google did something different to get the extra second in:
>   >
> http://googleblog.blogspot.de/2011/09/time-technology-and-leaping-seconds.html
>   >
>   >Most devices probably don't even know about the leap second coming as
>   >that would require a firmware upgrade.
>   >
>   >
>   >Karsten
>   >
>   >2015-01-25 16:19 GMT+01:00 Mike. <the.lists at mgm51.com>:
>   >> On 1/25/2015 at 9:37 AM Jay Ashworth wrote:
>   >>
>   >> |This June 30th, 235959UTC will be followed immediately by 235960UTC.
>   >> |
>   >> |What will /your/ devices do?
>   >>  =============
>   >>
>   >>
>   >> I've always wondered why this is such a big issue, and why it's done
>   >> as it is.
>   >>
>   >> In UNIX, for instance, time is measured as the number of seconds
>   >> since the UNIX epoch.  imo, the counting of the number of seconds
>   >> should not be "adjusted", unless there's a time warp of some sort.
>   >> The leap second adjustment should be in the display of the time,
>   >> i.e., similar to how time zones are handled.
>   >>
>   >>
>   >> fwiw
>   >>
>   >>
>   >>
>
> --
> Ken Chase - math at sizone.org Toronto
>