[time-nuts] End Of The World

[Frister]

Thank you Martin,
To be honest, I didn't know that the sleep command could be utilized with a <1
Foolish of me to not have tried it.





On 02/07/2015, Martin Burnicki <martin.burnicki at burnicki.net> wrote:
> Frister wrote:
>> My NTP server did a double 59 on the terminal. for anybody who is
>> interested
>> I captured the event :
>> https://youtu.be/OpNci29CI7E
>
> I think you need to be careful if you just watch the time in a loop with
> a "sleep 1". Due to slightly varying sleep intervals the time when the
> "date" command is called may interfere with the second boundary of the
> system time, so you may observe missing or duplicate times anyway.
>
> Eventually the following command shows less ambiguous results:
>
> while true; do date -u +'%F %T.%N'; sleep 0.25; done
>
> E.g.:
>
> 2015-07-02 09:46:01.236101917
> 2015-07-02 09:46:01.490039978
> 2015-07-02 09:46:01.743952328
> 2015-07-02 09:46:01.997539363
> 2015-07-02 09:46:02.251356539
> 2015-07-02 09:46:02.505238060
> 2015-07-02 09:46:02.759204117
> 2015-07-02 09:46:03.013218510
> 2015-07-02 09:46:03.267194076
> 2015-07-02 09:46:03.521256275
> 2015-07-02 09:46:03.775118487
> 2015-07-02 09:46:04.029012022
> 2015-07-02 09:46:04.283006237
> 2015-07-02 09:46:04.537024946
> 2015-07-02 09:46:04.790874099
>
> Usually you get 4 timestamps per second, but eventually there may be
> only 3 or so, depending on the accuracy of the sleep intervals. In any
> case you have the fractions of the second to *see* that there is
> eventually a second :03.999999999 where you expected :04.000000000, or
> vice versa.
>
> Martin
>
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