System.Time.Clock Design Issues

Aaron Denney wnoise at
Tue Feb 8 14:51:20 EST 2005

On 2005-02-08, John Goerzen <jgoerzen at> wrote:
> On 2005-02-08, David Menendez <zednenem at> wrote:
>> As I understand it, TAI and UTC can both be described in terms of a
>> clock counting SI seconds. The difference is that a TAI day is always
>> 86400 seconds long, whereas a UTC day can be 86399 - 86401 seconds,
>> depending on which second it is.
> No, I believe a UTC day is also always exactly 86400 seconds long.


> Some seconds may be longer than others (though this happens only at
> Leap Second events).  At least this is how it works in POSIX.

POSIX (stupidly) mandates that 86400 time_t seconds / day, yes.

Aaron Denney

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