Leap second happening Post: 302664915

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Operating Systems Linux Fedora Leap second happening Post 302664915 by jim mcnamara on Sunday 1st of July 2012 11:22:51 AM

07-01-2012

Registered User

I would not worry about it. You will notice that timekeeping structures like struct stat and struct tm (standard C, which is the basis of timekeeping in UNIX) are leap-second aware.

Leap seconds are kept by Linux. And shells there are compliant with it. This is true only if the box is connected to an ntp service. Tracking leap seconds is not required by POSIX, so your OS may not care. What OS do you have?

Unless you are doing precision time keeping like GPS, Realtime device monitoring, or Astronomy, it will NOT break what you are doing. Since you asked the question, I'm pretty sure you cannot be involved in something that would be affected in any way.

jim mcnamara

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LEARN ABOUT CENTOS

datetime::leapsecond

DateTime::LeapSecond(3) 				User Contributed Perl Documentation				   DateTime::LeapSecond(3)

NAME

       DateTime::LeapSecond - leap seconds table and utilities

VERSION

       version 1.04

SYNOPSIS

	 use DateTime;
	 use DateTime::LeapSecond;

	 print "Leap seconds between years 1990 and 2000 are ";
	 print DateTime::Leapsecond::leap_seconds( $utc_rd_2000 ) -
	       DateTime::Leapsecond::leap_seconds( $utc_rd_1990 );

DESCRIPTION

       This module is used to calculate leap seconds for a given Rata Die day. It is used when DateTime.pm cannot compile the XS version of this
       code.

       This library is known to be accurate for dates until December 2009.

       There are no leap seconds before 1972, because that's the year this system was implemented.

       o   leap_seconds( $rd )

	   Returns the number of accumulated leap seconds for a given day, in the range 0 .. 22.

       o   extra_seconds( $rd )

	   Returns the number of leap seconds for a given day, in the range -2 .. 2.

       o   day_length( $rd )

	   Returns the number of seconds for a given day, in the range 86398 .. 86402.

SEE ALSO

       <http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.html>

       http://datetime.perl.org

AUTHOR

       Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE

       This software is Copyright (c) 2013 by Dave Rolsky.

       This is free software, licensed under:

	 The Artistic License 2.0 (GPL Compatible)

perl v5.16.3							    2014-06-09						   DateTime::LeapSecond(3)