Re: Time Change DST 2007 question

From the email sent by IBM yesterday. See 4.3.3 DST Workaround.


lamar




AIX O/S updated to support 2007 Daylight Saving Time change - (default)


The Energy Policy Act of 2005 (Public Law 109-58) was passed by the
United States Congress on July 29, 2005 and signed into law on August 8,
2005. This law changes the time-change dates for Daylight Saving Time in
the United States. Beginning in 2007, DST will begin on the second
Sunday in March and end on the first Sunday in November.

IBM has released updates to the AIX 5L operating systems to support this
change. The updates should be applied prior to March 11, 2007.

AIX 5L Version 5.3
IBM recommends installing Technology Level 4 or later. The update is
also available as a specific fix by installing the fix for APAR IY75211
Filesets: bos.rte.libc.5.3.0.40 and bos.adt.prof.5.3.0.40

AIX 5L Version 5.2
IBM recommends installing Technology Level 8 or later. The update is
also available as a specific fix by installing the fix for APAR IY75213
Filesets: bos.rte.libc.5.2.0.85 and bos.adt.prof.5.2.0.85

AIX 5L Version 5.1 (Out of support)
The update is available as a specific fix by installing the fix for APAR
IY75214
Filesets: bos.rte.libc.5.1.0.70 and bos.adt.prof.5.1.0.70

To download these fixes, visit:
Quick links for AIX fixes
<http://www14.software.ibm.com/webapp/set2/sas/f/genunix3/aixfixes.html>


AIX 4.3.3 DST Workaround (Out of support)
You can manually specify when to start and stop DST by setting the TZ
environment variable in the /etc/environment file. An example for the US
Central timezone follows:

TZ=CST6CDT,M3.2.0,M11.1.0
"M3.2.0" means to go on DST starting in month 3 (March), week 2, and Day
0 (Sunday).
"M11.1.0" means 1st Sunday in November.
NOTE: Reboot the system before March, 2007 so all processes running will
pick up the new time change.





_____

From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of
Naylor, Jim
Sent: Friday, December 15, 2006 9:01 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question



So if my TZ entry in /etc/environment looks like this:



TZ=CST6CDT



Then I would change it to what?



Thanks,
Jim Naylor
Unix/Storage Systems Administrator
Schnuck Markets, Inc.
* Direct (314) 994-4784
))( Cell (314) 691-0186
Fax (314) 994-4684
* E-Mail jnaylor@xxxxxxxxxxxx

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx]On
Behalf Of Lamar Saxon
Sent: Friday, December 15, 2006 8:29 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question

You will need to edit the TZ variable in /etc/environment.



You will also need to restart all processes that use the $TZ
variable. Best bet is to a quick reboot so that all processes have the
new changes to TZ in their environment.



Lamar




_____


From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On
Behalf Of Naylor, Jim
Sent: Friday, December 15, 2006 8:06 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question



Hello All,

Can you just use the touch command on /etc/environment or do you
actually have to change the TZ value? When do you have to do this, any
time prior to the time change or after the time change occurs?



Thanks,
Jim Naylor
Unix/Storage Systems Administrator
Schnuck Markets, Inc.
* Direct (314) 994-4784
))( Cell (314) 691-0186
Fax (314) 994-4684
* E-Mail jnaylor@xxxxxxxxxxxx

-----Original Message-----
From: IBM AIX Discussion List
[mailto:aix-l@xxxxxxxxxxxxx]On Behalf Of Christopher Baker
Sent: Monday, November 20, 2006 3:39 PM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question


Robert,

Unless there is something wrong with the reading of TZ,
then, yes, all you have to do is alter the value of TZ in
/etc/environments file.

Looking at the fixes for 5.1 and 5.2 and some of 5.3, it
looks like the fixes are for SMIT or WLM which you get around by just
doing the editing. Of course, if you install a box at the lower ML
level, you will have to re-do the edit of the TZ variable.

We have some very critical 5.3 boxes that are not at the
minimum TL4 level, but we do not plan, for now, to touch them.... So we
may be editing the TZ variable also.

Good luck

Christopher M. Baker
Senior Technical Support Analyst
HPCE - Linux Cluster Development and Support
Goodyear Tire and Rubber Company
330.796.1725

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Contains Confidential and/or Proprietary Information.
May not be copied or disseminated without the expressed
written consent of The Goodyear Tire & Rubber Company.
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Robert Miller <rmiller@xxxxxxxx>
Sent by: IBM AIX Discussion List <aix-l@xxxxxxxxxxxxx>

11/20/2006 10:28 AM

Please respond to
IBM AIX Discussion List <aix-l@xxxxxxxxxxxxx>

To

aix-l@xxxxxxxxxxxxx

cc



Subject

Re: Time Change DST 2007 question










Best I could tell from trying to download the APAR is
that for 5.2 you'll need to go to ML8 if you're not already. If you
check the box labelled 'keep me at my current maintenance level', it
won't let you download the fix until you change the level you're at to
ML8.

I have some news from a vendor that the workaround for
4.3.X may work, but it's unverified as of yet... can anyone confirm or
deny that simply changing the TZ environment variable will work?

--rm


_____


From: IBM AIX Discussion List
[mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of Larry Scheetz
Sent: Monday, November 20, 2006 6:58 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Time Change DST 2007 question

Admins,

Below I have copied from IBM web page recommended
"Apars" for the DST change in 2007. I want to make sure I have this all
ready to go. I currently have some machines running 5.1 and 5.2 and was
wondering if these below will cover what I need. Also, would any of
these require a reboot of the systems? Thank you for your time in
advance. I am currently in EST.

Thanks
Larry


AIX 5.1
IY75214 DAYLIGHT SAVING TIME DEFAULT CHANGING IN 2007
IY34203 SMITTY CHTZ APPENDING 2 COMMAS AFTER TZ
IY49871 SMITTY CHTZ_USER LIMITS THE EDITING OF TIMEZONE
TO THREE CHARACTERS
IY21283 PROBLEM WITH SMITTY CHTZ_USER MENU WHEN SOME
FIELD ARE LEFT BLANK
IY75214 DAYLIGHT SAVING TIME DEFAULT CHANGING IN 2007

AIX 5.2
IY75213 DAYLIGHT SAVING TIME DEFAULT CHANGING IN 2007
(This APAR is included in Technology
Level 5200-08 and later.)
IY35629 SMITTY CHTZ APPENDING 2 COMMAS AFTER TZ
IY49813 SMITTY CHTZ_USER LIMITS THE EDITING OF TIMEZONE
TO THREE CHARACTERS
IY39159 DEFAULT DST TZ SETTINGS WITH AN OFFSET FAILS TO
RETURN TO STD
IY39312 SETTING TZ FAILS WITH QUOTED TIMEZONES
IY43243 CRITICAL FIXES FOR AIX 5.2 AS OF APRIL 2003
IY44169 WLM CONFIGURATION SET DOESN'T WORK RIGHT WHEN
CHANGING TZ (TIME ZONE)
IY37121 IN UDF FILESYSTEMS, LOSTFILES.DIR HAS OLD DATE
IY37445 TIMEZONE DEFAULTS FOR NEW ZEALAND INCORRECT
IY75213 DAYLIGHT SAVING TIME DEFAULT CHANGING IN 2007



_____


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