On Wed, Feb 01, 2023 at 04:52:15PM +0100, Miroslav Lichvar wrote:

> > +   if (next) {
> > +           atop.jumpSeconds = next->local_tai_offset - 
> > tz->local_tai_offset;
> > +           atop.timeOfNextJump.seconds_lsb = next->timestamp;
> > +   }
> 
> Is this intentionally not setting the _msb field, ignoring distant future?

Yes, it is intentional.  The LSB is 32 bits of seconds, so the range is

(/ (/ (/ 4294967295 3600) 24) 365) = 136 years

It is hard for me to understand why a time zone should change more
that one year in the future from a given date?

Thanks,
Richard





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