[LEAPSECS] BBC radio Crowd Science

[Brooks Harris]

On 2017-01-31 02:50 PM, GERRY ASHTON wrote:
>> ...On January 31, 2017 at 7:08 PM Steve Allen <sla at ucolick.org> wrote in part:
>> I prefer to think of a leap second as being truly intercalary.
>> It is saying to atomic clock "It's not tomorrow yet, wait a second."
>> It is between one calendar day of UTC and the next calendar day of UTC.
>> It belongs to neither of them...
> UTC is civil time. Civil time is used to express deadlines. Most deadlines fall at the end of a calendar day, so which day the 61st second falls in will only affect a few time zones, but deadlines may fall on other hour boundaries. So it is necessary to know which hour the 61st second belongs to, and I believe it belongs to the hour that is about to end.
I don't think anyone disagrees that the Leap Second is the last second 
of a day, "pushing" the midnight roll-over. That's clear from Rec 460. 
But when the TAI-UTC value increments is an important question.
>
> Gerard Ashton
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