shell - Unix time and leap seconds -


regarding unix (posix) time, wikipedia says:

due handling of leap seconds, neither linear representation of time nor true representation of utc.

but unix date command not seem aware of them actually

$ date -d '@867715199' --utc mon jun 30 23:59:59 utc 1997 $ date -d '@867715200' --utc tue jul  1 00:00:00 utc 1997

while there should leap second there @ mon jun 30 23:59:60 utc 1997.

does mean date command ignores leap seconds, while concept of unix time doesn't?

the number of seconds per day fixed unix timestamps.

the unix time number 0 @ unix epoch, , increases 86400 per day since epoch.

so cannot represent leap seconds. os slow down clock accommodate this. leap seconds not existent far unix timestamps concerned.


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