11-06-2003
I'm sure what your manual meant to say is that your clock is accurate to within plus or minus 3 seconds a month. The accuracy of the clock is dependent on the hardware.
On HP systems a technician can adjust the accuracy of the clock if it is way off. But +/- 3 seconds/month is not bad.
For greater accuracy, you can run NTP, a networking service that keeps your clock in sync with super accurate network visible clocks. That will keep you to within a second very easily.
The official unix standard demands that the seconds of a minute be within the range 0 to 59 and each day must comprise exactly 86,400 seconds. This allows you to precompute the number of seconds between two times in the future. But it also means that leap seconds are illegal. So a strictly conforming unix system must be off by one second every now and then. However, it is common to violate the prohibition against leap seconds. This is the only constraint on clock accuracy that unix attempts to impose.
See
this thread.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi all,
The server seems to be losing time, not a lot, but enough to be noticed.
UNIX
AIX 4.3.3
Any ideas,
Kathy (9 Replies)
Discussion started by: kburrows
9 Replies
2. UNIX for Advanced & Expert Users
can anybody tel lme,how to instal NTS -150 on a unix network,it needs some patch to fetch time frm serve,,?? (2 Replies)
Discussion started by: pesty
2 Replies
3. Shell Programming and Scripting
Hi guys,
I know that this topic has been discuss numerous times, and I have search the net and this forum for it.
However, non able to address the problem I faced so far.
I am on Solaris Platform and unable to install additional packages like the GNU date and gawk to make use of their... (5 Replies)
Discussion started by: DrivesMeCrazy
5 Replies
4. Solaris
I have a cluster of two Solaris server (veritas cluster). one working and the other is standby
I am going to change the date on them , and am looking for a secure solution as it is giving an important service.
my opinion is that the active one doesn't need to be restarted (if I don't change the... (1 Reply)
Discussion started by: barry1946
1 Replies
5. Shell Programming and Scripting
Hi Folks,
My server time is in EDT. And i am sending automated mails from that server in which i need to display the current date time as per IST (GMT+5:30). Please advice how to display the date time as per IST.
IST time leads 9:30 mins to EDT. and i wrote something like below.
... (6 Replies)
Discussion started by: Showdown
6 Replies
6. Shell Programming and Scripting
Hi guys thanks for the help for my previous posts.Now i have a requirement that i download a XMl file which has UTC time stamp.I need to convert UTC time into Unix server timezone.
For ex if the time zone of unix server is CDT then i need to convert into CDT.whatever may be the system time... (5 Replies)
Discussion started by: mohanalakshmi
5 Replies
7. Programming
Dear all,
I am kindly seeking assistance on the following issue.
I am working with data that is sampled every 0.05 hours (that is 3 minutes intervals) here is a sample data from the file
5.00000 15.5030
5.05000 15.6680
5.10000 16.0100
5.15000 16.3450
5.20000 16.7120
5.25000... (4 Replies)
Discussion started by: malandisa
4 Replies
8. UNIX for Dummies Questions & Answers
Our Unix system is losing a considerable amount of time each day, and our support service company says our motherboard is the cause. They "upgraded" us 5 years ago to basically the same thing as what we had previously, and are looking to "upgrade" us again now for about $5,000... I think... (23 Replies)
Discussion started by: Big Z
23 Replies
9. Shell Programming and Scripting
Hi All,
I have one file which contains time for request and response.
I want to calculate time difference in milliseconds for each line.
This file can contain 10K lines.
Sample file with 4 lines.
for first line.
Request Time: 15:23:45,255
Response Time: 15:23:45,258
Time diff... (6 Replies)
Discussion started by: Raza Ali
6 Replies
LEARN ABOUT OSX
datetime::leapsecond
DateTime::LeapSecond(3) User Contributed Perl Documentation DateTime::LeapSecond(3)
NAME
DateTime::LeapSecond - leap seconds table and utilities
VERSION
version 0.77
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) 2012 by Dave Rolsky.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)
perl v5.16.2 2013-08-25 DateTime::LeapSecond(3)