[LEAPSECS] DNS examples

Brooks Harris brooks at edlmax.com
Fri Jan 23 19:08:09 EST 2015

On 2015-01-23 10:33 AM, Clive D.W. Feather wrote:
> Steffen Nurpmeso said:
>>   |> Well.  PHK follows the IERS format which uses the 1st of the month
>>   |> after the leap second, i.e., the second after the leap occurred.
>>   |
>>   |This is an implementation detail.  PHK???s choice is as good as the other.
>> And i disagree with that.  The ISO C(99) standard doesn't offer
>> a JDN-TO-Gregorian and vice versa calculation.  There is the
>> well-known algorithm from Communications of the ACM, Vol 6, No 8,
>> but it is not in the standard.
> Irrelevant. The C Standard, in general, holds only those facilities which
> either can't be expressed in terms of the Standard language itself
> (e.g. printf) or which are extremely common and therefore benefit from
> having a standard name (e.g. strcpy).
> Converting JDN to Gregorian fits into neither of these categories, so it
> does not belong in the C Standard.
>> So in order to calculate the
>> actual date where the drift adjustment occurs you have to face
>> a very elaborate conversion.
> No, you need to use a library that's already been written to do the job.
> Takes 10 seconds or so.
What "library that's already been written to do the job" are you 
referring to, specifically?


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