|BoxMatrix >> Lexicon >> Internationalisation >> Leap-Second||@|
|Short for:||Leap Second|
|Location:||Lexicon >> Internationalisation|
|Description:||Occasional 1-second correction of the UTC|
A Leap-Second is a positive or negative 1-second correction of the UTC to keep the time in sync with the earth rotation.
solar day is one rotation of the earth, which is drifting and which is not as precise as our need for accuracy of time.
The speed of the rotation of the earth is not stable and it is slowly decreasing.
To keep an UTC day in sync with a
mean solar day the UTC specification permits to insert or remove a second when it's
required. This is permitted at the end of each month, but all corrections so far happened on
Jun 30 or
A negative Leap-Second removes the time
23:59:59 from the end of the respective month:
23:59:57 -> 23:59:58 -> 0:00:00
A positive Leap-Second adds the time
23:59:60 to the end of the respective month:
23:59:59 -> 23:59:60 -> 0:00:00
So far (2022-08) 27 Leap-Seconds were applied since 1972, all of which were positive.
Since the chrony.conf used does not contain a
leapsecmode directive the default mode
system is used.
This means that the system time will be tweaked by the Kernel as explained above, doing a "hard" switch.
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