Re: [LEAPSECS] Comparing Time Scales

From: John Cowan <>
Date: Sat, 4 Feb 2006 10:43:25 -0500

Tim Shepard scripsit:

> A computer system could represent UTC time in a way which also makes
> this clear, for example by a structure or abstract data type which
> includes in it (1) the day number and (2) how-many nanoseconds are we
> into this day. When executing a leap second insertion, we would get
> all the way up to 86,400,999,999,999 nano seconds in the day before we
> wrapped around that field to zero and incremented the day number (one
> nanosecond later).

How is this really different from using broken-out time and allowing
the seconds field to go up to 60?

Current Posix broken-out time has a field for "DST in effect", which can
be ignored most of the time except during the fall transition hour, when
it is on for the first run from 02:00:00 to 02:59:59 and off for the
second run.

My confusion is rapidly waxing          John Cowan
For XML Schema's too taxing:  
    I'd use DTDs              
    If they had local trees --
I think I best switch to RELAX NG.
Received on Sat Feb 04 2006 - 10:40:37 PST

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