North American Network Operators Group

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Leap second reminder

  • From: Kevin Day
  • Date: Sat Dec 31 12:59:44 2005



Just a reminder, at midnight UTC there's a leap second added to most time systems.

Some time systems will stop the clock at 23:59:59.999999 for 1 second, some will display 23:59:60 for a second.

Since the last leap second (1998), "leap second aware" time keeping systems(NTP, GPS, etc) have become much more prevalent, so it's much more likely this time that applications and NTP sync'ed devices will see a leap second happen(rather than have them manually corrected later, or not corrected at all). But, I'm not too sure how well everyone has tested applications and devices for how they handle the clock stopping for a second OR an "invalid" time of 23:59:60.

If anyone sees anything die at 00:00:00UTC I'd be interested to know.

-- Kevin