[154420] in North American Network Operators' Group
Re: F-ckin Leap Seconds, how do they work?
daemon@ATHENA.MIT.EDU (Steven Bellovin)
Tue Jul 3 17:55:38 2012
From: Steven Bellovin <smb@cs.columbia.edu>
In-Reply-To: <CMM.0.95.0.1341349580.roll@rutten.stupi.se>
Date: Tue, 3 Jul 2012 17:54:59 -0400
To: Peter Lothberg <roll@Stupi.SE>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jul 3, 2012, at 5:06 PM, Peter Lothberg wrote:
>
>
> On one of my BSD boxes. /usr/src/share/zoneinfo/leapseconds, I see no
> "-"
No, but they're allowed; see Figure 9 of RFC 5905:
LI Leap Indicator (leap): 2-bit integer warning of an impending leap
second to be inserted or deleted in the last minute of the current
month with values defined in Figure 9.
+-------+----------------------------------------+
| Value | Meaning |
+-------+----------------------------------------+
| 0 | no warning |
| 1 | last minute of the day has 61 seconds |
| 2 | last minute of the day has 59 seconds |
| 3 | unknown (clock unsynchronized) |
+-------+----------------------------------------+
Figure 9: Leap Indicator
--Steve Bellovin, https://www.cs.columbia.edu/~smb
