question about DST

Hi list,

Our Goverment is implementing DST. DST starts on : on Sunday, June 1, 2008
at 12:01 (this is the first time we are going for DST)

*So we have to forward our clock by one hour.*


In this regards I have few questions how to make ready our ntp server which
is serving all our machine

All machines using local time not UTC.

1. Is it possible to adjust only the ntp server for DST thing and let all
other machines automatically get the new time from ntp server?

1.1. If not do I have to adjust all machine clocks manually?

As i said before its the first time that we are going for DST here in our
country and this is totally new thing for me.

Any help in this regard will be greatly appreciated.

Note: please reply to me direct as i am not subscribe to mailing list.


Regards.

Asrai khn wrote:[color=blue]
> Hi list,
>
> Our Goverment is implementing DST. DST starts on : on Sunday, June 1, 2008
> at 12:01 (this is the first time we are going for DST)
>
> *So we have to forward our clock by one hour.*[/color]

NTP knows nothing of time zones or seasonal changes.

Your OS vendor should have a patch for you to apply that will let your OS
display the correct local time which is an offset from UTC.

--
Peter Laws / N5UWY
National Weather Center / Network Operations Center
University of Oklahoma Information Technology
[email]plaws@ou.edu[/email]
-----------------------------------------------------------------------
Feedback? Contact my director, Craig Cochell, [email]craigc@ou.edu[/email]. Thank you!

_______________________________________________
questions mailing list
[email]questions@lists.ntp.org[/email]
[url]https://lists.ntp.org/mailman/listinfo/questions[/url]

--- StripMime Report -- processed MIME parts ---
multipart/mixed
text/plain (text body -- kept)
text/plain (text body -- kept)
---

[email]asraikhn@gmail.com[/email] (Asrai khn) writes:
[color=blue]
>Hi list,[/color]
[color=blue]
>Our Goverment is implementing DST. DST starts on : on Sunday, June 1, 2008
>at 12:01 (this is the first time we are going for DST)[/color]
[color=blue]
>*So we have to forward our clock by one hour.*[/color]

[color=blue]
>In this regards I have few questions how to make ready our ntp server which
>is serving all our machine[/color]
[color=blue]
>All machines using local time not UTC.[/color]
[color=blue]
>1. Is it possible to adjust only the ntp server for DST thing and let all
>other machines automatically get the new time from ntp server?[/color]

No. NTP knows nothing about DST. It operates in UTC.


[color=blue]
>1.1. If not do I have to adjust all machine clocks manually?[/color]


What operating system?
[color=blue]
>As i said before its the first time that we are going for DST here in our
>country and this is totally new thing for me.[/color]
[color=blue]
>Any help in this regard will be greatly appreciated.[/color]
[color=blue]
>Note: please reply to me direct as i am not subscribe to mailing list.[/color]

It is not a mailing list, it is a news group. Keep coming back for
information.



[color=blue]
>Regards.[/color]

Unruh wrote:[color=blue]
>
> It is not a mailing list, it is a news group. Keep coming back for
> information.[/color]

You are right, in that the definitive forum is
news:comp.protocols.time.ntp, however there is a mailing list gatewayed
to it, and many people are unaware of its true nature.

> From: Unruh <unruh-spam@physics.ubc.ca>[color=blue]
> Date: Fri, 30 May 2008 20:10:19 GMT
> Sender: questions-bounces+oberman=es.net@lists.ntp.org
>
>
> [email]asraikhn@gmail.com[/email] (Asrai khn) writes:
>[color=green]
> >Note: please reply to me direct as i am not subscribe to mailing list.[/color]
>
> It is not a mailing list, it is a news group. Keep coming back for
> information.[/color]

No. It is both a mailing list and a news group. A great many of us have
abandoned usenet and read this via the mail list. I assume Asrai sent
his question to the mail list. You read it via the news group. Since you
ignored his request to copy him, he will never see your response of:
[color=blue]
> 1. Is it possible to adjust only the ntp server for DST thing and let all
> other machines automatically get the new time from ntp server?[/color]

No. NTP knows nothing about DST. It operates in UTC.


[color=blue]
> 1.1. If not do I have to adjust all machine clocks manually?[/color]


What operating system?

--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: [email]oberman@es.net[/email] Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751

_______________________________________________
questions mailing list
[email]questions@lists.ntp.org[/email]
[url]https://lists.ntp.org/mailman/listinfo/questions[/url]

--- StripMime Report -- processed MIME parts ---
multipart/mixed
multipart/signed
text/plain (text body -- kept)
application/pgp-signature
text/plain (text body -- kept)
---

Asrai khn wrote:[color=blue]
> Hi list,
>
> Our Goverment is implementing DST. DST starts on : on Sunday, June 1, 2008
> at 12:01 (this is the first time we are going for DST)
>
> *So we have to forward our clock by one hour.*
>
>
> In this regards I have few questions how to make ready our ntp server which
> is serving all our machine
>
> All machines using local time not UTC.
>
> 1. Is it possible to adjust only the ntp server for DST thing and let all
> other machines automatically get the new time from ntp server?[/color]

No. NTP does not concern itself with time zones or issues of daylight
vs. standard time! NTP deals ONLY in UTC! Displaying local time is the
responsibility of the Operating System. You generally have to configure
something in the O/S to tell it what time zone you wish to use for the
display of time and what the current rules for changing from standard to
DST and back are.

(from the man page for date)
" -u Display (or set) the date in Greenwich Mean Time
(GMT-universal time), bypassing the normal conversion
to (or from) local time."

A single machine might display different times for users in different
time zones!

Asrai khn wrote:[color=blue]
>
> In this regards I have few questions how to make ready our ntp server which
> is serving all our machine[/color]

There is nothing that you can do to NTP, as it does not deal with
anything but UTC.
[color=blue]
>
> All machines using local time not UTC.
>
> 1. Is it possible to adjust only the ntp server for DST thing and let all
> other machines automatically get the new time from ntp server?[/color]

No.
[color=blue]
>
> 1.1. If not do I have to adjust all machine clocks manually?[/color]

Except for MS-DOS, you should be able to update them all in advance of
the change, although, in some cases, you may need to reboot. I wrote
more detail about this in reply to a similar question very recently, so
please read the archives.

In the mean time, you may find <http://www.twinsun.com/tz/tz-link.htm>
helpful.

Unfortunately, you don't identify your country, and your name is not one
whose language I recognize, so I cannot, easily, check that the Olson
timezone data has been updated, or whether Microsoft have issued an
official update. In both cases, you can update the data yourself,
although, if the Olson data is not correct, they should be informed.

As others have hinted, if you are paying for support for any OS, the
vendor should be providing the necessary procedures.

On Fri, 30 May 2008, Kevin Oberman wrote:
[color=blue][color=green]
>> From: Unruh <unruh-spam@physics.ubc.ca>
>> Date: Fri, 30 May 2008 20:10:19 GMT
>> Sender: questions-bounces+oberman=es.net@lists.ntp.org
>>
>>
>> [email]asraikhn@gmail.com[/email] (Asrai khn) writes:
>>[color=darkred]
>>> Note: please reply to me direct as i am not subscribe to mailing list.[/color]
>>
>> It is not a mailing list, it is a news group. Keep coming back for
>> information.[/color]
>
> No. It is both a mailing list and a news group. A great many of us have
> abandoned usenet and read this via the mail list. I assume Asrai sent
> his question to the mail list. You read it via the news group. Since you
> ignored his request to copy him, he will never see your response of:[/color]

Ah, ok. But then he should subscribe to the mailing list while he is asking
questions of the list or the newgroup. Ie, expecting people to privately
email him answers to questions which he asks in public is not a good idea.
It deprives others of the benefit of the answers ( or of the benefit of
having the mistakes in the answers pointed out by other more knowledgeable
people.)[color=blue]
>[color=green]
>> 1. Is it possible to adjust only the ntp server for DST thing and let all
>> other machines automatically get the new time from ntp server?[/color]
>
> No. NTP knows nothing about DST. It operates in UTC.
>
>
>[color=green]
>> 1.1. If not do I have to adjust all machine clocks manually?[/color]
>
>
> What operating system?[/color]

Just to amplify, Under Linux, BSD and others, the crucial file in something
called
tzdata.
[url]ftp://elsie.nci.nih.gov/pub/tzdata*.gz[/url]
which can be downloaded from the web. In that file are listed all the known
time regions together with their DST rules. They update it about 10 times a year, every time they become aware of some new time zone information from somewhere in the world. Compiling it with zic, installing it,
and pointing your system to the appropriate file is all you need. That will
handle all changes like DST automatically with no intervention needed.

Under Windows, I do not believe any such structure exists, and you have to
persuade Microsoft to publish a patch for your system which contains the
info. But I may be wrong. Under Mac, I think that they also use the tzdata
database to handle time, but again I could be wrong.
Thus his telling us what OS he uses would enable more helpful answers to
be given.

[color=blue]
>[/color]

Bill Unruh wrote:
[color=blue]
> Ah, ok. But then he should subscribe to the mailing list while he is asking
> questions of the list or the newgroup. Ie, expecting people to privately[/color]

Definitely.

[color=blue]
> [url]ftp://elsie.nci.nih.gov/pub/tzdata*.gz[/url]
> which can be downloaded from the web. In that file are listed all the known[/color]

"known" may be the issue. Unless the country is Morocco, in which case
it is untrue that they have never had DST changes (although the last one
was quite possibly before the questioner was born (1978), there is no
trace of a matching rule in asia or africa, the two files that have
changed recently.

If it is is Morocco, Olson believes that the change is at 00:00:00 UTC,
not at 12:01:00, or even 00:01:00 UTC. If it is actually one of these,
Olson needs an urgent update - it may be too late to not do it
retrospectively. (The Olson data indicates a change to DST at 12:00:00
UTC 1967, so it is certainly possible that the 12:01 was in 24 hour
format and doesn't mean 12:01 am.)

I think Morocco is quite likely.
[color=blue]
>
> Under Windows, I do not believe any such structure exists, and you have to
> persuade Microsoft to publish a patch for your system which contains the[/color]

The information is held in the registry, or similar. The Morroco (and
Pakistan) changes were too late for Microsoft, but there is a, possibly
unofficial, advisory
<http://blogs.msdn.com/nickmac/archive/2008/05/30/advisory-changes-to-daylight-saving-time-in-morocco-and-pakistan-on-june-1-2008.aspx>
pointing to the manual procedure.

On 2008-05-30, Kevin Oberman <oberman@es.net> wrote:
[color=blue]
> Unruh <unruh-spam@physics.ubc.ca> wrote:
>[color=green]
>> [email]asraikhn@gmail.com[/email] (Asrai khn) writes:
>>[color=darkred]
>>> Note: please reply to me direct as i am not subscribe to mailing
>>> list.[/color]
>>
>> It is not a mailing list, it is a news group. Keep coming back for
>> information.[/color]
>
> No. It is both a mailing list and a news group. A great many of us
> have abandoned usenet and read this via the mail list. I assume Asrai
> sent his question to the mail list. You read it via the news group.
> Since you ignored his request to copy him, he will never see your
> response of:[/color]

Actually, one _must_ be subscribed to the mailing-list to post to it.
And subscribers automatically receive a copy of all list traffic.

--
Steve Kostecke <kostecke@ntp.org>
NTP Public Services Project - [url]http://support.ntp.org/[/url]

Bill Unruh wrote:
[][color=blue]
> Just to amplify, Under Linux, BSD and others, the crucial file in
> something
> called
> tzdata.
> [url]ftp://elsie.nci.nih.gov/pub/tzdata*.gz[/url]
> which can be downloaded from the web. In that file are listed all the
> known
> time regions together with their DST rules. They update it about 10
> times a year, every time they become aware of some new time zone
> information from somewhere in the world. Compiling it with zic,
> installing it, and pointing your system to the appropriate file is
> all you need. That will
> handle all changes like DST automatically with no intervention needed.
>
> Under Windows, I do not believe any such structure exists, and you
> have to
> persuade Microsoft to publish a patch for your system which contains
> the
> info. But I may be wrong. Under Mac, I think that they also use the
> tzdata
> database to handle time, but again I could be wrong.
> Thus his telling us what OS he uses would enable more helpful answers
> to
> be given.[/color]

Bill,

Under Windows, the equivalent information is held in the registry. There
is a Time Zone Editor available to allow you to define the details of your
time zone, if needed.

[url]http://download.microsoft.com/download/5/8/a/58a208b7-7dc7-4bc7-8357-28e29cdac52f/TZEDIT.exe[/url]

[url]http://support.microsoft.com/kb/927229[/url]

There is no need to "wait for Microsoft to publish a patch....."

Cheers,
David

Its mix of OS Linux, Unix (sun, freebsd) and yes we also have some hardware
of Lucent (MaxTNT) that running thers OS TAOS,

As i said we dont' have this DST before and its first time government is
implementing it (coz of sever power crises)

So you thinks its not good practice to change system clock with 'date'
command? by forwarding it by one hour.

I thinks to change it manually will also requires me to disable ntp sync
otherwise machine will correct its time again.

regards.

On Sat, May 31, 2008 at 1:36 AM, Kevin Oberman <oberman@es.net> wrote:
[color=blue][color=green]
> > From: Unruh <unruh-spam@physics.ubc.ca>
> > Date: Fri, 30 May 2008 20:10:19 GMT
> > Sender: questions-bounces+oberman=es.net@lists.ntp.org
> >
> >
> > [email]asraikhn@gmail.com[/email] (Asrai khn) writes:
> >[color=darkred]
> > >Note: please reply to me direct as i am not subscribe to mailing list.[/color]
> >
> > It is not a mailing list, it is a news group. Keep coming back for
> > information.[/color]
>
> No. It is both a mailing list and a news group. A great many of us have
> abandoned usenet and read this via the mail list. I assume Asrai sent
> his question to the mail list. You read it via the news group. Since you
> ignored his request to copy him, he will never see your response of:
>[color=green]
> > 1. Is it possible to adjust only the ntp server for DST thing and let all
> > other machines automatically get the new time from ntp server?[/color]
>
> No. NTP knows nothing about DST. It operates in UTC.
>
>
>[color=green]
> > 1.1. If not do I have to adjust all machine clocks manually?[/color]
>
>
> What operating system?
>
> --
> R. Kevin Oberman, Network Engineer
> Energy Sciences Network (ESnet)
> Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
> E-mail: [email]oberman@es.net[/email] Phone: +1 510 486-8634
> Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
>[/color]

On May 31, 1:52 am, David Woolley
<da...@ex.djwhome.demon.co.uk.invalid> wrote:[color=blue]
> Asrai khn wrote:
>[color=green]
> > In this regards I have few questions how to make ready our ntp server which
> > is serving all our machine[/color]
>
> There is nothing that you can do to NTP, as it does not deal with
> anything but UTC.
>
>
>[color=green]
> > All machines using local time not UTC.[/color]
>[color=green]
> > 1. Is it possible to adjust only the ntp server for DST thing and let all
> > other machines automatically get the new time from ntp server?[/color]
>
> No.
>
>
>[color=green]
> > 1.1. If not do I have to adjust all machine clocks manually?[/color]
>
> Except for MS-DOS, you should be able to update them all in advance of
> the change, although, in some cases, you may need to reboot. I wrote
> more detail about this in reply to a similar question very recently, so
> please read the archives.
>
> In the mean time, you may find <http://www.twinsun.com/tz/tz-link.htm>
> helpful.
>
> Unfortunately, you don't identify your country, and your name is not one
> whose language I recognize, so I cannot, easily, check that the Olson
> timezone data has been updated, or whether Microsoft have issued an
> official update. In both cases, you can update the data yourself,
> although, if the Olson data is not correct, they should be informed.
>
> As others have hinted, if you are paying for support for any OS, the
> vendor should be providing the necessary procedures.[/color]

Pakistan.

On May 31, 3:17 am, David Woolley
<da...@ex.djwhome.demon.co.uk.invalid> wrote:[color=blue]
> Bill Unruh wrote:[color=green]
> > Ah, ok. But then he should subscribe to the mailing list while he is asking
> > questions of the list or the newgroup. Ie, expecting people to privately[/color]
>
> Definitely.
>[color=green]
> >[url]ftp://elsie.nci.nih.gov/pub/tzdata*.gz[/url]
> > which can be downloaded from the web. In that file are listed all the known[/color]
>
> "known" may be the issue. Unless the country is Morocco, in which case
> it is untrue that they have never had DST changes (although the last one
> was quite possibly before the questioner was born (1978), there is no
> trace of a matching rule in asia or africa, the two files that have
> changed recently.
>
> If it is is Morocco, Olson believes that the change is at 00:00:00 UTC,
> not at 12:01:00, or even 00:01:00 UTC. If it is actually one of these,
> Olson needs an urgent update - it may be too late to not do it
> retrospectively. (The Olson data indicates a change to DST at 12:00:00
> UTC 1967, so it is certainly possible that the 12:01 was in 24 hour
> format and doesn't mean 12:01 am.)
>
> I think Morocco is quite likely.
>
>
>[color=green]
> > Under Windows, I do not believe any such structure exists, and you have to
> > persuade Microsoft to publish a patch for your system which contains the[/color]
>
> The information is held in the registry, or similar. The Morroco (and
> Pakistan) changes were too late for Microsoft, but there is a, possibly
> unofficial, advisory
> <http://blogs.msdn.com/nickmac/archive/2008/05/30/advisory-changes-to-...>
> pointing to the manual procedure.[/color]

Pakistan Government will change from GMT +5:00 to GMT +6:00 June 1,
2008, at 12 midnight (local time).

So switching from +5:00 to +6:00 GMT is what i have to do at OS side?

[email]asraikhn@gmail.com[/email] wrote:
[color=blue]
>
> Pakistan.[/color]

The Olson data indicates that there was a previous use of DST in 2002.
If that didn't happen, it needs fixing to give correct historic information.

It has had data for 2008 since May 19th, although it looks like they
could do with more official information; if the transition time is
actually 00:01:00 local wall clock time, rather than 00:00:00 please
submit a correction, and if possible include a copy of, or a link to, an
official document - English would be better, but I'm sure they would be
able to find someone who can read Urdu (the submission information is at
the top of the relevant file (asia) - it doesn't require supporting
documents, but I can't see that they will do any harm:

=========================================
# From Arthur David Olson (2008-05-19):
# XXX--midnight transitions is a guess; 2008 only is a guess.

# Rule NAME FROM TO TYPE IN ON AT SAVE
LETTER/S
Rule Pakistan 2002 only - Apr Sun>=2 0:01 1:00 S
Rule Pakistan 2002 only - Oct Sun>=2 0:01 0 -
Rule Pakistan 2008 only - Jun 1 0:00 1:00 S
Rule Pakistan 2008 only - Sep 1 0:00 0 -
=========================================
"man zic", on a system that supports Olson data, tells you how to
interpret the files and how to create new binary versions.

The Microsoft article also gives information for manually updating
Windows for the Pakistan change. I believe they are using 00:00:00 as
the transition time.

It looks like neither Pakistan nor Morocco has considered computer
useres in the timing of the announcement of the DST legislation.

[email]asraikhn@gmail.com[/email] wrote:
[color=blue]
> Pakistan Government will change from GMT +5:00 to GMT +6:00 June 1,
> 2008, at 12 midnight (local time).
>
> So switching from +5:00 to +6:00 GMT is what i have to do at OS side?
>[/color]

Assuming all your systems are Windows NT family, or Olson (Linux and
modern Unixes) based, and were previously correctly configured for the
Pakistan timezone, rather than explicitly set to five hours ahead of
GMT, you need to perform the Windows procedures, I referenced, on the
Windows systems. The Windows changes will repeat at the same change
each year, so will need undoing, after September, if that is not
appropriate.

For the Olson systems, you need to download the current data (URLs have
already been given) and run zic on them. You may need to override the
directory, and, if you do it on a live system, it may be advisable to
build in a temporary directory and move them to the correct place, as I
don't know zic updates the files in a safe way. Some systems soft link
...../etc/localtime to the the correct timezone data file, but others
hard link or copy that file, and you should make sure that you actually
end up with the right file. The file you should actually be using is
..../zoneinfo/Asia/Karachi; if you weren't using that before, you may
need to compensate for any side effects of your old solution. Double
check that this file has the same contents as
..../zoneinfo/posix/Asia/Karachi. If you really needed the "right"
versions, you ought already do know about them.

The current Olson data will not affect subsequent years, so you will
need new data for next year. If you actually know that the legislation
covers several years, you can update the Olson data to reflect this,
before installing. Please then submit the correction.

Olson changes don't need a reboot. I believe the same is true for
Windows, but could be wrong.

Some older Unix systems set an environment variable, on boot, that
encodes the rules. This can be overriden by user login scripts, or in
the master login script. Some versions of this will be able to encode
the Pakistan transition times, but it is possible that some cannot.
This change will repeat every year, like on Windows. You will probably
need to reboot systems after doing this.

By my reckoning you have about 7 hours to do the above, and get a
seamless transition.

Some very old Unix systems have the, obsolete, US rules hard coded, and
you will need to change an environment variable setting as close as
possible to the transition and reboot, also close to the transition.

On Sat, 31 May 2008, Asrai khn wrote:
[color=blue]
> Its mix of OS Linux, Unix (sun, freebsd) and yes we also have some hardware
> of Lucent (MaxTNT) that running thers OS TAOS,
>
> As i said we dont' have this DST before and its first time government is
> implementing it (coz of sever power crises)[/color]

Which country?
[color=blue]
>
> So you thinks its not good practice to change system clock with 'date'
> command? by forwarding it by one hour.[/color]

You can do anything you want. BUt on a linux/Unix system it is all handled
by the zoneinfo files. Just update your tzdata file and forget about it.
[color=blue]
>
> I thinks to change it manually will also requires me to disable ntp sync
> otherwise machine will correct its time again.[/color]

Yes. So why do it. Just download the file and install it and be happy.

[color=blue]
>
> regards.
>
> On Sat, May 31, 2008 at 1:36 AM, Kevin Oberman <oberman@es.net> wrote:
>[color=green][color=darkred]
>>> From: Unruh <unruh-spam@physics.ubc.ca>
>>> Date: Fri, 30 May 2008 20:10:19 GMT
>>> Sender: questions-bounces+oberman=es.net@lists.ntp.org
>>>
>>>
>>> [email]asraikhn@gmail.com[/email] (Asrai khn) writes:
>>>
>>>> Note: please reply to me direct as i am not subscribe to mailing list.
>>>
>>> It is not a mailing list, it is a news group. Keep coming back for
>>> information.[/color]
>>
>> No. It is both a mailing list and a news group. A great many of us have
>> abandoned usenet and read this via the mail list. I assume Asrai sent
>> his question to the mail list. You read it via the news group. Since you
>> ignored his request to copy him, he will never see your response of:
>>[color=darkred]
>>> 1. Is it possible to adjust only the ntp server for DST thing and let all
>>> other machines automatically get the new time from ntp server?[/color]
>>
>> No. NTP knows nothing about DST. It operates in UTC.
>>
>>
>>[color=darkred]
>>> 1.1. If not do I have to adjust all machine clocks manually?[/color]
>>
>>
>> What operating system?
>>
>> --
>> R. Kevin Oberman, Network Engineer
>> Energy Sciences Network (ESnet)
>> Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
>> E-mail: [email]oberman@es.net[/email] Phone: +1 510 486-8634
>> Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
>>[/color]
>[/color]

--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | [email]unruh@physics.ubc.ca[/email]
Canada V6T 1Z1 | and Gravity | [url]www.theory.physics.ubc.ca/[/url]

[email]asraikhn@gmail.com[/email] writes:
[color=blue]
>On May 31, 3:17 am, David Woolley
><da...@ex.djwhome.demon.co.uk.invalid> wrote:[color=green]
>> Bill Unruh wrote:[color=darkred]
>> > Ah, ok. But then he should subscribe to the mailing list while he is asking
>> > questions of the list or the newgroup. Ie, expecting people to privately[/color]
>>
>> Definitely.
>>[color=darkred]
>> >[url]ftp://elsie.nci.nih.gov/pub/tzdata*.gz[/url]
>> > which can be downloaded from the web. In that file are listed all the known[/color]
>>
>> "known" may be the issue. Unless the country is Morocco, in which case[/color][/color]

He claims to be in Pakistan. The latest tzdata file KNOWS about the change

#
Rule Pakistan 2002 only - Apr Sun>=2 0:01 1:00 S
Rule Pakistan 2002 only - Oct Sun>=2 0:01 0 -
Rule Pakistan 2008 only - Jun 1 0:00 1:00 S
Rule Pakistan 2008 only - Sep 1 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Karachi 4:28:12 - LMT 1907
5:30 - IST 1942 Sep
5:30 1:00 IST 1945 Oct 15
5:30 - IST 1951 Sep 30
5:00 - KART 1971 Mar 26 # Karachi Time
5:00 Pakistan PK%sT # Pakistan Time

[color=blue]
>So switching from +5:00 to +6:00 GMT is what i have to do at OS side?[/color]

NO. What you have to do is go to that nist site, download the latest tzdata
file
tzdata2008c.tar.gz
to your Linux machine

untar it
tar -xzf tzdata2008c.tar.gz
zic asia
rm /etc/localtime
cp /usr/share/zoninfo/Asia/Karachi /etc/localtime

And you are done.
You can copy that same file to your other Linux ( and probably unix)
machines as well, and you are done.

On Windows follow Moe's suggestion.

David Woolley <david@ex.djwhome.demon.co.uk.invalid> writes:
[color=blue]
>asraikhn@gmail.com wrote:[/color]
[color=blue][color=green]
>>
>> Pakistan.[/color][/color]
[color=blue]
>The Olson data indicates that there was a previous use of DST in 2002.
>If that didn't happen, it needs fixing to give correct historic information.[/color]
[color=blue]
>It has had data for 2008 since May 19th, although it looks like they
>could do with more official information; if the transition time is
>actually 00:01:00 local wall clock time, rather than 00:00:00 please
>submit a correction, and if possible include a copy of, or a link to, an
>official document - English would be better, but I'm sure they would be[/color]

All the web pages state midnight.
And many also state that DST was used in 2002 but failed to catch on due to
mass confusion. Announcing a change two weeks before they are to happen
seems guarenteed to cause mass confusion again.

[color=blue]
>able to find someone who can read Urdu (the submission information is at
>the top of the relevant file (asia) - it doesn't require supporting
>documents, but I can't see that they will do any harm:[/color]
[color=blue]
>=========================================
># From Arthur David Olson (2008-05-19):
># XXX--midnight transitions is a guess; 2008 only is a guess.[/color]
[color=blue]
># Rule NAME FROM TO TYPE IN ON AT SAVE
>LETTER/S
>Rule Pakistan 2002 only - Apr Sun>=2 0:01 1:00 S
>Rule Pakistan 2002 only - Oct Sun>=2 0:01 0 -
>Rule Pakistan 2008 only - Jun 1 0:00 1:00 S
>Rule Pakistan 2008 only - Sep 1 0:00 0 -
>=========================================
>"man zic", on a system that supports Olson data, tells you how to
>interpret the files and how to create new binary versions.[/color]
[color=blue]
>The Microsoft article also gives information for manually updating
>Windows for the Pakistan change. I believe they are using 00:00:00 as
>the transition time.[/color]
[color=blue]
>It looks like neither Pakistan nor Morocco has considered computer
>useres in the timing of the announcement of the DST legislation.[/color]

Bill Unruh wrote:[color=blue]
> On Sat, 31 May 2008, Asrai khn wrote:[/color]

I didn't see this one on the newsgroup.[color=blue]
>[color=green]
>> Its mix of OS Linux, Unix (sun, freebsd) and yes we also have some hardware
>> of Lucent (MaxTNT) that running thers OS TAOS,[/color][/color]

Linux and freebsd will use Olson. Sun may or may not, depending on how
old it is. I have no information on Lucent systems, although, if they
run NTP one would expect them to have some method of configuring the
timezone, or it will be designed to run purely on UTC.
[color=blue][color=green]
>>
>> As i said we dont' have this DST before and its first time government is
>> implementing it (coz of sever power crises)[/color][/color]

The evidence suggests this is the second time, the first being in 2002.
[color=blue]
>[color=green]
>> So you thinks its not good practice to change system clock with 'date'
>> command? by forwarding it by one hour.[/color][/color]

If you are running ntpd, the only reason for changing it manually is to
get it within 1000s before starting ntpd. Only on MS-DOS based systems,
of the systems that you are likely to have, do you need to change the clock.[color=blue]
>[color=green]
>> I thinks to change it manually will also requires me to disable ntp sync
>> otherwise machine will correct its time again.[/color][/color]

If you change the clock by an hour, ntpd will abort. You need to keep
the clock set to the same time and change the timezone data. If you try
to restart ntpd, it will either abort or undo the change, depending on
what options you use.