Re: Time Change DST 2007 question
- From: "Green, Simon" <simon.green@xxxxxxx>
- Date: Sat, 16 Dec 2006 15:31:49 -0000
I think that IBM are just stuck with a bad choice made many years ago.
Default values for the TZ are hard-coded in there, taking the old USA
practices. Consequently, many users just use the simple form of the TZ
variable, (xxxNyyy). These users will suffer. Anybody who already uses
the full-form of the TZ variable, or changes it should be immune to this
mess.
It would seem simpler by far to strip out all that code and just inform
people that they need to make one, simple environment change.
However, it doesn't really affect me (since none of the systems I manage
at the moment are in the USA).
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of
Mark Monroe
Sent: 15 December 2006 19:11
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question
From what I understand the daylight savings thing is just a change inthe dates that the change will begin/end. On a 4.3.3 box I have here, I
went into smit, change date/time and then looked at the option to
"Change Time Zone Using User Inputted Values". There are options in
here to create your own start/end dates/times.
I don't understand why we cant just put in the new dates and be done
with it. This would leave the standard time id and offsets alone to
work as they always have.
Thoughts/Ideas?
Mark
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx]On Behalf Of
Green, Simon
Sent: Friday, December 15, 2006 11:54 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question [html-removed]
The TZ "workaround" is a total fix. All the stupid code IBM have built
in to deal with time zones just implements defaults: anything you code
in TZ over-rides it. Remember: most of the rest of the world uses
completely different timezones, changing on different days, at different
times. It all works fine for us, (provided we remember to over-ride the
default). IBM would have been better advised if they'd been a bit less
parochial right at the start and hadn't built in specific support for US
timezones, treating you the same way they do the rest of the world.
--
Simon Green
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of
Davignon, Edward
Sent: 15 December 2006 16:35
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question
While the TZ workaround may fix applications that handle dates in the
current year, how will it affect historical date calculations for
subroutines such as ctime, localtime, gmtime, mktime, difftime, asctime,
or tzset?
In AIX >5.2 the command zdump provides useful information. For example,
in my time zone: zdump -v EST5EDT
The command zdump and zic have been a part of the fileset bos.rte.date
since AIX 5.2. The truss command indicates that zdump uses the
directory "/usr/share/lib/zoneinfo". How are time zones handled in AIX
4.3.3? Are they built into libc.a?
Edward Davignon
Lead Analyst - Distributed Systems
Utility Shared Services - IT
Energy East Corporation
_____
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of
Yan Hu
Sent: Friday, December 15, 2006 9:53 AM
To: aix-l@xxxxxxxxxxxxx
Subject: Re: Time Change DST 2007 question
Hello, All
It seems that it has been confirmed that simply changing the TZ
environment variable will work for AIX version 4.3, 5.1, 5.2, and 5.3.
So I assume that for 5.2 and 5.3, it is not necessary to upgrade them to
ML8 and ML4, respectively.
Please correct me if I am wrong.
Thanks in advance.
Yan Hu
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx]On Behalf Of
Lamar Saxon
Sent: December 15, 2006 9:29 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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Robert Miller <rmiller@xxxxxxxx>
Sent by: IBM AIX Discussion List <aix-l@xxxxxxxxxxxxx>
11/20/2006 10:28 AM
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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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- Re: Time Change DST 2007 question
- From: Mark Monroe
- Re: Time Change DST 2007 question
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