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Re: Leap second reminder
- From: Gerry Boudreaux
- Date: Sat Dec 31 14:50:15 2005
On Dec 31, 2005, at 11:58 AM, Kevin Day wrote:
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.
My Juniper seems to be aware:
xxx@juniper> show ntp status
status=4694 leap_add_sec, sync_ntp, 9 events, event_peer/strat_chg,
version="ntpd 4.1.0-a Thu Jul 14 23:46:40 GMT 2005 (1)",
processor="i386", system="JUNOS7.3R1.5", leap=01, stratum=3,
precision=-30, rootdelay=40.669, rootdispersion=49.522, peer=35302,
reftime=c7615c1c.65f78359 Sat, Dec 31 2005 13:35:56.398, poll=10,
clock=c7615d8e.d66d698f Sat, Dec 31 2005 13:42:06.837, state=4,
offset=-2.649, frequency=73.810, jitter=5.194, stability=0.024
note the leap=01 and leap_add_sec