Original question is attached.
OK, here is how I tested the change from BST to GMT and it's effect on CRON.
I used this to set the system clock, and to see the 26th to the 27th
changeover (just for curiosity).
date -u 9610262259.50 ; date # BST
At 2am (not sure if its 1:59.59) the time should go from BST to GMT and
the time will go back an hour to 1am. As per /etc/zoneinfo/sources/europe
Rule GB-Eire 1996 max - Oct lastSun 1:00s 0 GMT
NOTE: Changing the date will probably not give you a reliable result.
(I did NOT, I left it run on.)
# Crontab details to test BST to GMT changeover
#
# user_at_BST.HOST is just a host with a current and reliable clock.
#
# The "touch" command is a quick check to see if the job ran
#
30 0 * * * date | mailx -s "Cronjob output for 12:30am" user_at_BST.HOST ; touch /tmp/12:30am
0 1 * * * date | mailx -s "Cronjob output for 1am" user_at_BST.HOST ; touch /tmp/1am
30 1 * * * date | mailx -s "Cronjob output for 1:30am" user_at_BST.HOST ; touch /tmp/1:30am
0 2 * * * date | mailx -s "Cronjob output for 2am" user_at_BST.HOST ; touch /tmp/2am
30 2 * * * date | mailx -s "Cronjob output for 2:30am" user_at_BST.HOST ; touch /tmp/2:30am
Produced messages in this order,
1 Oct 27 system PRIVILEGED (607) Cronjob output for 12:30am
2 Oct 27 system PRIVILEGED (603) Cronjob output for 1am
3 Oct 27 system PRIVILEGED (606) Cronjob output for 1:30am
4 Oct 27 system PRIVILEGED (599) Cronjob output for 2am
5 Oct 27 system PRIVILEGED (602) Cronjob output for 1:30am
6 Oct 27 system PRIVILEGED (599) Cronjob output for 2am
7 Oct 27 system PRIVILEGED (602) Cronjob output for 2:30am
So, conclusively you can see that CRON on DU3.2g is not aware of TZ changes.
Although, an engineer at Digital was informed by an engineering collegue
that the code for this was present in CRON source.
I wonder what happens for GMT to BST, I guess CRON just forgets to do the
jobs completly! :-/
Come back in "March 1997" for an update to this series of DU quirks. :-)
Many Thanks to:
John G Dobnick <jgd_at_csd.uwm.edu> - CRON runs jobs twice!!
Herve Choplin <choplin_at_delphi.phys.univ-tours.fr> - 94/21/EC Directive
Scooter Morris <scooter_at_gene.com> - Explained TZ changeover
Gyula Szemenyei <szemgy_at_rkk.hu> - Explained TZ changeover
Hellebo Knut <Knut.Hellebo_at_nho.hydro.com> - Patch OSF350-224 (for 3.2C)
Regards David.
--
Cable OnLine Ltd.
Enquiries: 0800 506 506
http://www.cableol.net/ or http://www.cableol.co.uk
"Opinions" expressed in this message are mine!
From davidp_at_cableol.netTue Oct 22 16:54:54 1996
Date: Thu, 3 Oct 1996 14:37:24 +0100 (BST)
From: David Pesticcio <davidp_at_cableol.net>
To: alpha-osf-managers <alpha-osf-managers_at_sws1.ctd.ornl.gov>
Subject: October 26th, what happens to the system clock?
Hi all,
We here at Cable Online were wondering what impact there is, if any, on a
cronjob that is scheduled at 2am.
Digital, who are curently investigating, say that all will be fine, and
that the time and zone change will happen at 1am and will turn the clock
back by one whole hour. I have asked one of the tech people to give me a
breakdown on what happens and when.
So, along with that I was wondering if anyone out there knows of any
possible problems that may/will arrise on this wonderfull evening.
We are using mainly 3.2c on our Alpha's but will be going to 3.2g and
then 4.0 very soon.
Your comments are greatly appreciated, and I will post a summary before
the 26th if I have anything useful sent to me in response.
TIA
David
--
Cable OnLine Ltd.
Enquiries: 0800 506 506
http://www.cableol.net/ or
http://www.cableol.co.uk
"Opinions" expressed in this message are mine!
From Knut.Hellebo_at_nho.hydro.comTue Oct 22 17:05:54 1996
Date: Wed, 9 Oct 1996 14:56:50 +0200
From: Hellebo Knut <Knut.Hellebo_at_nho.hydro.com>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
[The following text is in the "iso-8859-1" character set]
[Your display is set for the "US-ASCII" character set]
[Some characters may be displayed incorrectly]
Regards,
Check out the patch called OSF350-224 (for 3.2C)
--
******************************************************************
* Knut Hellebx | DAMN GOOD COFFEE !! *
* Norsk Hydro a.s | (and hot too) *
* Phone: +47 55 996870, Fax: +47 55 996342 | *
* Pager: +47 96 500718 | *
* E-mail: Knut.Hellebo_at_nho.hydro.com | Dale Cooper, FBI *
******************************************************************
From jgd_at_csd.uwm.eduTue Oct 22 17:05:54 1996
Date: Fri, 4 Oct 1996 10:22:42 -0500 (CDT)
From: John G Dobnick <jgd_at_csd.uwm.edu>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
David Pesticcio writes:
>
> We here at Cable Online were wondering what impact there is, if any, on a
> cronjob that is scheduled at 2am.
My experience is that things scheduled to run during the "duplicated
times" run twice -- once for each instance of the "local time".
Thus, if you have soemthing scheduled at 1:30 am, it will run at 1:30,
and then run again at the second 1:30. Very annoying. Plays merry
hell with logging/accounting functionS.
--
John G Dobnick "Knowing how things work is the basis
Information & Media Technologies for appreciation, and is thus a
University of Wisconsin - Milwaukee source of civilized delight."
jgd_at_csd.uwm.edu ATTnet: (414) 229-5727 -- William Safire
From szemgy_at_rkk.huTue Oct 22 17:05:54 1996
Date: Thu, 3 Oct 1996 20:01:12 +0200 (MET DST)
From: Gyula Szemenyei <szemgy_at_rkk.hu>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
Hi,
On Thu, 3 Oct 1996, David Pesticcio wrote:
>
> Hi all,
>
> We here at Cable Online were wondering what impact there is, if any, on a
> cronjob that is scheduled at 2am.
The problem solution is following:
You do not have to edit crontab files:
there're the time-zone info files int the /etc/zoneinfo/sources dir.
You have to edit your own file (e.g. europe, and Continental Europe
Section) the DST observe time.
After it you have to compile this file with zic (eg.: zic europe).
That's all.
I hope this helps.
Best Regards,
Gyula Szemenyei
-|-------------------------|-
| |
|
http://www.rkk.hu/~szemgy|
| |
-|-------------------------|-
From choplin_at_delphi.phys.univ-tours.frTue Oct 22 17:05:54 1996
Date: Thu, 03 Oct 1996 18:07:07 +0100
From: Herve Choplin <choplin_at_delphi.phys.univ-tours.fr>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
[The following text is in the "iso-8859-1" character set]
[Your display is set for the "US-ASCII" character set]
[Some characters may be displayed incorrectly]
David Pesticcio wrote:
>
> Hi all,
>
> We here at Cable Online were wondering what impact there is, if any, on a
> cronjob that is scheduled at 2am.
>
> Digital, who are curently investigating, say that all will be fine, and
> that the time and zone change will happen at 1am and will turn the clock
> back by one whole hour. I have asked one of the tech people to give me a
> breakdown on what happens and when.
>
> So, along with that I was wondering if anyone out there knows of any
> possible problems that may/will arrise on this wonderfull evening.
>
> We are using mainly 3.2c on our Alpha's but will be going to 3.2g and
> then 4.0 very soon.
>
> Your comments are greatly appreciated, and I will post a summary before
> the 26th if I have anything useful sent to me in response.
>
> TIA
>
> David
> --
> Cable OnLine Ltd.
> Enquiries: 0800 506 506
> http://www.cableol.net/ or http://www.cableol.co.uk
> "Opinions" expressed in this message are mine!
From Decision (94/21/EC Directive) of European Council the
changing of Summer to Winter hour is not during the night of 28-29
September but is during the night of 26-27 october 1996.
It's necessary to change the Rules for EET MET WET and GB-Eire Timezones
in the file /etc/zoneinfo/sources/europe and run zic.
--
Hervé CHOPLIN Tél: (33) 47.36.69.38
UNIVERSITÉ FRANÇOIS RABELAIS Fax: (33) 47.36.70.40
UFR Sciences et Techniques
37200 TOURS FRANCE e-mail:
choplin_at_delphi.phys.univ-tours.fr
-----------------------------------------------------------------------------
URL:
http://delphi.phys.univ-tours.fr/HC/Choplin_fr.html
-----------------------------------------------------------------------------
From scooter_at_gene.comTue Oct 22 17:05:54 1996
Date: Thu, 3 Oct 1996 08:11:06 -0700
From: Scooter Morris <scooter_at_gene.com>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
David,
In reality "nothing" happens on October 26 to the system clock. Unix
runs on GMT internally, and calls to "localtime" are calculated based on
a number of parameters which are associated with the timezone. So, a call
to localtime at 1:59am will return 1:59am PDT: a call to localtime two minutes
later will return 1:01am PST. The rules for this are all contained in files
in /etc/zoneinfo -- a system that was created when Congress kept insisting on
messing around with Daylight Savings Time. The rule file is in
/etc/zoneinfo/sources/northamerica -- check it out.
-- scooter
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Date: Wed, 9 Oct 1996 14:56:50 +0200
From: Hellebo Knut <
Knut.Hellebo_at_nho.hydro.com>
Message-Id: <
9610091456.ZM27221_at_bgedsg01.nho.hydro.com>
In-Reply-To: David Pesticcio <davidp_at_cableol.net>
"October 26th, what happens to the system clock?" (Oct 3, 2:37pm)
References: <
Pine.LNX.3.91.961003143047.23303W-100000_at_pariah.private.cableol.net>
Reply-To:
Knut.Hellebo_at_nho.hydro.com
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Regards,
Check out the patch called OSF350-224 (for 3.2C)
--
******************************************************************
* Knut Hellebx | DAMN GOOD COFFEE !! *
* Norsk Hydro a.s | (and hot too) *
* Phone: +47 55 996870, Fax: +47 55 996342 | *
* Pager: +47 96 500718 | *
* E-mail:
Knut.Hellebo_at_nho.hydro.com | Dale Cooper, FBI *
******************************************************************
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From: John G Dobnick <jgd_at_csd.uwm.edu>
Message-Id: <199610041522.KAA19448_at_alpha2.csd.uwm.edu>
Subject: Re: October 26th, what happens to the system clock?
To: davidp_at_cableol.net (David Pesticcio)
Date: Fri, 4 Oct 1996 10:22:42 -0500 (CDT)
In-Reply-To: <
Pine.LNX.3.91.961003143047.23303W-100000_at_pariah.private.cableol.net> from "David Pesticcio" at Oct 3, 96 02:37:24 pm
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Content-Type: text
Status: RO
X-Status:
David Pesticcio writes:
>
> We here at Cable Online were wondering what impact there is, if any, on a
> cronjob that is scheduled at 2am.
My experience is that things scheduled to run during the "duplicated
times" run twice -- once for each instance of the "local time".
Thus, if you have soemthing scheduled at 1:30 am, it will run at 1:30,
and then run again at the second 1:30. Very annoying. Plays merry
hell with logging/accounting functionS.
--
John G Dobnick "Knowing how things work is the basis
Information & Media Technologies for appreciation, and is thus a
University of Wisconsin - Milwaukee source of civilized delight."
jgd_at_csd.uwm.edu ATTnet: (414) 229-5727 -- William Safire
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Date: Thu, 3 Oct 1996 20:01:12 +0200 (MET DST)
From: Gyula Szemenyei <szemgy_at_rkk.hu>
To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
In-Reply-To: <
Pine.LNX.3.91.961003143047.23303W-100000_at_pariah.private.cableol.net>
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Hi,
On Thu, 3 Oct 1996, David Pesticcio wrote:
>
> Hi all,
>
> We here at Cable Online were wondering what impact there is, if any, on a
> cronjob that is scheduled at 2am.
The problem solution is following:
You do not have to edit crontab files:
there're the time-zone info files int the /etc/zoneinfo/sources dir.
You have to edit your own file (e.g. europe, and Continental Europe
Section) the DST observe time.
After it you have to compile this file with zic (eg.: zic europe).
That's all.
I hope this helps.
Best Regards,
Gyula Szemenyei
-|-------------------------|-
| |
|
http://www.rkk.hu/~szemgy|
| |
-|-------------------------|-
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To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
References: <
Pine.LNX.3.91.961003143047.23303W-100000_at_pariah.private.cableol.net>
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Status: RO
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David Pesticcio wrote:
> =
> Hi all,
> =
> We here at Cable Online were wondering what impact there is, if any, on=
a
> cronjob that is scheduled at 2am.
> =
> Digital, who are curently investigating, say that all will be fine, and=
> that the time and zone change will happen at 1am and will turn the cloc=
k
> back by one whole hour. I have asked one of the tech people to give me =
a
> breakdown on what happens and when.
> =
> So, along with that I was wondering if anyone out there knows of any
> possible problems that may/will arrise on this wonderfull evening.
> =
> We are using mainly 3.2c on our Alpha's but will be going to 3.2g and
> then 4.0 very soon.
> =
> Your comments are greatly appreciated, and I will post a summary before=
> the 26th if I have anything useful sent to me in response.
> =
> TIA
> =
> David
> --
> Cable OnLine Ltd.
> Enquiries: 0800 506 506
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=46rom Decision (94/21/EC Directive) of European Council the
changing of Summer to Winter hour is not during the night of 28-29
September but is during the night of 26-27 october 1996.
It's necessary to change the Rules for EET MET WET and GB-Eire Timezones
in the file /etc/zoneinfo/sources/europe and run zic.
-- =
Herv=E9 CHOPLIN T=E9l: (33) 47.36.69.38
UNIVERSIT=C9 FRAN=C7OIS RABELAIS Fax: (33) 47.36.70.40
UFR Sciences et Techniques =
37200 TOURS FRANCE e-mail:
choplin_at_delphi.phys.univ-tours.fr
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From POPmail Thu Oct 3 16:30:07 1996
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From: "Scooter Morris" <scooter_at_gene.com>
Message-Id: <961003081106.ZM16747_at_kansas.gene.com>
Date: Thu, 3 Oct 1996 08:11:06 -0700
In-Reply-To: David Pesticcio <davidp_at_cableol.net>
"October 26th, what happens to the system clock?" (Oct 3, 2:37pm)
References: <
Pine.LNX.3.91.961003143047.23303W-100000_at_pariah.private.cableol.net>
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To: David Pesticcio <davidp_at_cableol.net>
Subject: Re: October 26th, what happens to the system clock?
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David,
In reality "nothing" happens on October 26 to the system clock. Unix
runs on GMT internally, and calls to "localtime" are calculated based on
a number of parameters which are associated with the timezone. So, a call
to localtime at 1:59am will return 1:59am PDT: a call to localtime two minutes
later will return 1:01am PST. The rules for this are all contained in files
in /etc/zoneinfo -- a system that was created when Congress kept insisting on
messing around with Daylight Savings Time. The rule file is in
/etc/zoneinfo/sources/northamerica -- check it out.
-- scooter
Received on Tue Oct 22 1996 - 22:10:40 NZDT