At 14:58 -0400 on 06/07/2013, John Gilmore wrote about Re: Age of
datasets in hours, not days?:
The arithmetic of multiple moduli and several simultaneous cycles
used to convert counter values into calendar dates always numbers
seconds in the sequence
0, 1, 2, . . . , 59
It knows nothing of and cannot create a time value of the form xx xx 60.
The use of a second marked as 60 is a notation to indicate the extra
second in the day when a leap second occurs. That last minute of the
day is 61 seconds long. This is the same as calling midnight 24:00:00
in lieu of 00:00:00 to signify it as being the last second of the day
before the indicated date as opposed to the first second of that date.
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