[LEAPSECS] Time math libraries, UTC to TAI

[Brooks Harris]

Hi Stephen,

On 2016-12-28 02:02 PM, Stephen Scott wrote:
>
> Hello Brooks;
>
>
>> [ As discussed on the list many times, POSIX's use of the term "UTC" 
>> in describing "the epoch" as "1970-01-01 00:00:00 UTC" is troublesome 
>> because it lies before 1972-01-01T00:00:00 (UTC) in the "rubber band 
>> era", the development period of TAI and UTC when the TAI-UTC offset 
>> was not integral seconds. The name of the timescale and the TAI-UTC 
>> values during that span is somewhat controversial. In any event, as a 
>> practical matter, the origin of POSIX "the epoch" is usually taken to 
>> mean 63072000 seconds 
> That should be 63072010 seconds (730 days x 86400 plus 10 seconds)

I don't think so. This is POSIX so-called "1970-01-01 00:00:00 UTC" not 
1588/PTP. 1588/PTP epoch is 10s earlier.

-Brooks

> -Stephen
>> before 1972-01-01 00:00:10 (TAI) = 1972-01-01T00:00:00 (UTC) ].
>>
>>
>> -Brooks
>>
>>> Tony.
>>
>>
>>
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