William Unruh <un...@invalid.ca> wrote: > On 2015-01-19, Mike S <mi...@flatsurface.com> wrote: >> On 1/18/2015 6:04 PM, William Unruh wrote: >> >>> UTC always has 86400 seconds per year. >> >> You clearly don't understand how leap seconds work. You're embarrassing >> yourself now. When there's a leap second, there are 86401 SI seconds in > > I AM clearly embarrasing myself, since 86400 is the number of seconds > per SAY not year. Slight difference! > > Of course there are 86401 seconds in a day including a leap second. But > UTC only sees 86400. It forgets about one of them.
I am not sure what you mean by "sees", but I cant figure a meaning that would be compatible with the fact that UTC clearly identifies 86401 seconds on the day the leap second occurs. Maybe the confusion arises from considering UTC dates as "time interval" quantities, which they are not, rather than timescale readings. TAI days have 86400s, UTC days may have 86401 seconds ; so it happens that when TAI reads 00h00:00, UTC reads 23:59:60. That is what makes computing time intervals more complicated in UTC than in TAI but neither TAI nor UTC is defined by the number of seconds elapsed since an epoch. -- François Meyer
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