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From
SubjectRe: GPS Leap Second Scheduled!
Date
Followup to:  <35FAD20D.DBA99899@his.com>
By author: Feuer <feuer@his.com>
In newsgroup: linux.dev.kernel
> >
> >         64-bit seconds field (same as time_t) linked to UTC
> >         32-bit nanosecond field (microsecond for timeval) linked to TAI
> >         32-bit integral TAI-UTC difference
> >
> > That way any moment in time will be uniquely derivable at least, at a
> > positive leap second, you will see the progression (where T means a
> > time_t value divisible by 86400):
> >  
>
> Why would you have the TAI-UTC difference instead of just TAI?
> The part of your message below was very confusing to me.
>

Because it is smaller (fewer bits needed) than another timefield, and
an important piece of information in itself.

time_t needs to be UTC, there really is no choice.

-hpa
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