[LEAPSECS] Toasting Unix timestamp 1234567890

Magnus Danielson magnus at rubidium.dyndns.org
Sat Feb 14 15:01:14 EST 2009

Zefram skrev:

> M. Warner Losh wrote:

>> I'd phrase these like so:


>> UTC's 1970 and 1971 together had 63072001.999918 SI seconds (exactly).


> That's not quite true. They had that many *TAI* seconds, but TAI seconds

> are not equal to SI seconds. TAI is an imperfect realisation of the

> SI second. UTC(TT) is a mildly interesting notion.


>> The TAI time scale ticked 63072001.999918 SI seconds (exactly), while

>> UTC ticked 63072000 "seconds" between 00:00:00 1970-01-01 UTC and

>> 00:00:00 1972-01-01 UTC.


> UTC ticked some 63072000.107757997 seconds in that time. Of greater

> relevance is that UTC ticked exactly 730 days (as you indicate).

You mean to say it ticked 93072000.107757997 SI seconds in that time?
Notice that we have several "seconds" here so we may need to qualify
them as "SI seconds", "TAI seconds" and "UTC seconds" to make language
clear for this particular era.

> So many nits to pick.

Oh yes.


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