On Thu, Jan 01, 2009 at 05:55:45PM -0800, Darren Pilgrim wrote:
> This came up during discussion of leap seconds and why UTC and TAI are
> different. My question is, does FreeBSD's internal clock use UTC or TAI
> for timekeeping? That is, is wallclock calculated from an exact count
> of the number of seconds since epoch (TAI), then adjusted with a leap
> seconds table to match UTC, or does it internally use UTC and have code
> to deal with the ambiguous seconds that occur at each leap second?
I think the answer is no.
Instead I believe FreeBSD follows the POSIX rules which mandates using
UTC, while completely ignoring the concept of leap seconds.
There was a long thread over on freebsd-current@ in early January 2006
titled "FreeBSD handles leapsecond correctly" that discussed this at length.
(The general consensus seems to have been that leap seconds are evil and a
PITA and essentially impossible to handle 'correctly' since various
standards differ on how they should be handled. What to do about them is
less clear however.)
--
Erik Trulsson
ertr1...@student.uu.se
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