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New daylight savings 2007

Thomas A. Williams
Regular Advisor

New daylight savings 2007

I did a fair amount of searching for this and couldn't find a good answer.

There will be a new daylight savings start and end date starting 2007 (at least for the US). How will VMS handle this? Do we need to install a patch?

Thanks in advance.
20 REPLIES
Karl Rohwedder
Honored Contributor

Re: New daylight savings 2007

I would assume, that a TDF patch will be made available. This was the case for the last modifications.

regards Kalle
matthew robey
Frequent Advisor

Re: New daylight savings 2007

Thomas A. Williams
Regular Advisor

Re: New daylight savings 2007

I was hoping for a definitive answer from someone in HP. We here can't really fly by the seat of our pants.

I guess I'll log a call with HP support.

Thanks for all your help.
George_145
Valued Contributor

Re: New daylight savings 2007

The changes needed to support the new Daylight Savings changes will ship in TZ and ACRTL patch kits. Both will be needed to install the new functionality.

George Pagliarulo
OpenVMS Remedial Patch Process
Thomas A. Williams
Regular Advisor

Re: New daylight savings 2007

Thanks very much George.
Thomas A. Williams
Regular Advisor

Re: New daylight savings 2007

One more question:

Any idea when the patch kits mentioned above will be ready?
George_145
Valued Contributor

Re: New daylight savings 2007

The kits are in process now but we are still talking about what the ship date should be.

George Pagliarulo
OpenVMS Remedial Patch Process
Benjamin Levy
Frequent Advisor

Re: New daylight savings 2007

what version(s) of VMS will be supported by these kits, and will any UPDATE kits be required pre-requisites?
Jan van den Ende
Honored Contributor

Re: New daylight savings 2007

Thomas,

from your Forum Profile:


I have assigned points to 0 of 20 responses to my questions.


Maybe you can find some time to do some assigning?

http://forums1.itrc.hp.com/service/forums/helptips.do?#33

Mind, I do NOT say you necessarily need to give lots of points. It is fully up to _YOU_ to decide how many. If you consider an answer is not deserving any points, you can also assign 0 ( = zero ) points, and then that answer will no longer be counted as unassigned.
Consider, that every poster took at least the trouble of posting for you!

To easily find your streams with unassigned points, click your own name somewhere.
This will bring up your profile.
Near the bottom of that page, under the caption "My Question(s)" you will find "questions or topics with unassigned points " Clicking that will give all, and only, your questions that still have unassigned postings.

Thanks on behalf of your Forum colleagues.

PS. - nothing personal in this. I try to post it to everyone with this kind of assignment ratio in this forum. If you have received a posting like this before - please do not take offence - none is intended!

Proost.

Have one on me.

jpe
Don't rust yours pelled jacker to fine doll missed aches.
George_145
Valued Contributor

Re: New daylight savings 2007

Supported kits are V6.2, V7.3-2, V8.2 Alpha and V8.2 and V8.2-1 Integrity. ACRTL kits do not have any UPDATE requirements and since you need to install the ACRTL as well as the TZ kit, there will be no UPDATE kit requirements. There will be a requirement to have the latest PCSI utility kit installed.

George Pagliarulo
OpenVMS Remedial Patch Process
Benjamin Levy
Frequent Advisor

Re: New daylight savings 2007

Thanks for the info.

Do either of the kits require a reboot?
Jim_McKinney
Honored Contributor

Re: New daylight savings 2007

Any knowledge as to why changes to the C RTL are required? I would have thought that only the addition of new timezone rules would be necessary?
edward w. white
Occasional Advisor

Re: New daylight savings 2007

i may be really missing something here, but i change my clocks with a homemade batch job that directly calls SYS$SYSTEM:UTC$CONFIGURE_TDF.EXE. i do this on several 7.2-1 boxes. why would i need to patch vms for the 2007 changes?

it seems there won't be a patch for 7.2-1 anyway.
Jim_McKinney
Honored Contributor

Re: New daylight savings 2007

The US Energy Policy Act of 2005 changed the time change dates for Daylight Saving Time in the US Beginning in 2007. DST will begin on the second Sunday of March and end the first Sunday of November. This will require new rules being incorporated into daylight savings time change software for US states where time changes occur.
edward w. white
Occasional Advisor

Re: New daylight savings 2007

i understand why we are changing the times. my question is since i'm changing my times (wall clock and tdf) manually, will that method not work in 2007? when i tested my dcl code several years ago, i could change stuff all day long and vms (and old ism mumps) took the changes in stride.

Jim_McKinney
Honored Contributor

Re: New daylight savings 2007

For many systems only the system time matters. Perhaps yours is one of them.

But, you may run into problems if you run applications that use the C time functions since one of the values in the related time structure is a daylight savings indicator that may be loaded using the value of the system logical name SYS$TIMEZONE_DAYLIGHT_SAVING. The value of that logical is set based upon the timezone rule that is in effect. You can see the rule in the value of another system logical SYS$TIMEZONE_RULE. An incorrect value of that DST flag in the time structure will result in the return of a time that is off by an hour for locations that implement daylight savings time changes.
Jim_McKinney
Honored Contributor

Re: New daylight savings 2007

And, since you mention "old" ISM MUMPS, the CRTL behavior relative to time changed with VMS 6.0 (I think it was then). Prior to that only the system clock was considered. More recnet versions utilize the SYS$TIME* values.
edward w. white
Occasional Advisor

Re: New daylight savings 2007

i don't have either of those logicals. all i have is sys$timezone_differential. my understanding at the time was that utc$configure_tdf.exe sets that logical. for 721 that command is actually undocumented. what i know may be wrong.
Dave Dellarocco_1
Occasional Visitor

Re: New daylight savings 2007

I'm aware of the 2 patches that are required but there seems to be no mention of when to apply these. I would like to apply with my upgrades this summer but not sure if this will affect the up coming time change in October 06.

Any info would be appreciated.
Ian Miller.
Honored Contributor

Re: New daylight savings 2007

you can apply them now. They update the rules which determine what happens in the future.
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