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Daylight savings - USA

vamsikiran mallampalli
Greenhorn

Joined: Oct 12, 2006
Posts: 18
Hi all,
is anyone working on Daytime savings issue which is going to happen in 2007 march.
I will explain you briefly:
(Source: http://www-1.ibm.com/support/docview.wss?uid=swg21219396)
The passage of the Energy Policy Act of 2005 alters the Daylight Saving Time (DST) start and stop dates by four weeks. Extended Daylight Saving Time will begin in March of 2007. As a result of this change, APARs, maintenance, or actions will be required for the WebSphere Application Server and operating systems. Information about the Energy Policy Act can be found on the US Department of Energy Web site.

The Energy Policy Act changes the effective dates of DST. Beginning in 2007, DST start and end dates will be:

Start date: Second Sunday of March
End date: First Sunday of November


Note: These WebSphere Application Server fixes address time zone changes in the United States. However, similar DST changes taking place in Canada (and elsewhere in North America) next March are not covered by the fixes listed in this Flash, at this time. Further detailed information on those additional DST fixes will be furnished (here) in the near future.

If anyone is working on this issue lease reply here,i have some doubts..
Jeroen T Wenting
Ranch Hand

Joined: Apr 21, 2006
Posts: 1847
Why would you doubt the fact that daylight saving times in the US are changing?


42
Jim Yingst
Wanderer
Sheriff

Joined: Jan 30, 2000
Posts: 18671
Oh, let's not be coy, Jeroen. It should be obvious to any long-time rancher that "doubt" in Indian English == "question" in the Western world. If you want to encourage clearer communication, playing dumb isn't really the best strategy, I think.

So, Vamsikiran... what questions do you have? There are people here who know something about this, yes, so go ahead and ask.


"I'm not back." - Bill Harding, Twister
Jeroen T Wenting
Ranch Hand

Joined: Apr 21, 2006
Posts: 1847
He doesn't ask a question except for inquiring if anyone is actually working on it, so I have to assume he doubts the very existence of the change itself.
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18656
    
    8

I have to believe that somebody is working on the issue. Most likely none of the ranchers here are working on it, but it's certain that somebody is. But that isn't really your question, is it? It's always better to just ask your question rather than asking some indirect question like that.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42276
    
  64
Originally posted by Jeroen T Wenting:
He doesn't ask a question except for inquiring if anyone is actually working on it, so I have to assume he doubts the very existence of the change itself.


What do you mean: "...so I have to assume..."? That's a non-sequitur. The conclusion doesn't follow from the premise at all.


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Jeroen T Wenting
Ranch Hand

Joined: Apr 21, 2006
Posts: 1847
well, if noone were working on (or has worked on in the past) the change anywhere (like in writing the changes in law that provide for it) it wouldn't happen
vamsikiran mallampalli
Greenhorn

Joined: Oct 12, 2006
Posts: 18
Hi all,
I am correcting my yesterday's post.I have certain questions (questions in Western==doubts in Indian English(British English i hope)--may be you are right) regarding this daylight issue.

1)Please reply all the new timezones that are going to update with respect to this DST change? For eg:
CST --- America/Chicago
Similarly what will be new changes for the following:

EST --- ??(Now EST is pointing to US-Indiana, Eastern,US/Eastern-
Starke,US/Michigan....Will it be same?)
PST --- ?? (PST now is pointing to US-Pacific and Pacific New)
AKST---?? (nowUS/Alaska)
HAST -?? (nowUS/Aleutian)
MST-?? (NowUS/Arizona and US/Mountain)
HST-?? (Now US/Hawaii)

2)Also, during daytime period i.e, from second sunday of march to 2nd sunday of November will the timezone be still CST or will it be changed to CDT?

3) Where can i get the jdk patch related to this?

Please help me.
Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18656
    
    8

1. The names of the timezones are not changing. All that is changing is the rules for when daylight saving time applies. "CST" has always been a shortcut for "America/Chicago" but it has been deprecated for quite some time now, because of confusion with timezones elsewhere in the world whose names can be abbreviated to CST.

2. The name of the timezone is "CST". Date formatters will often print "CDT" for dates where daylight saving time is in force, but that's not the name of the timezone. This has also been the case for quite some time.

None of this has anything to do with the Energy Policy Act. It's just basic information about timezones, which I guess you haven't had to deal with yet. Timezones are an annoying thing because governments can change them at short notice and we computer people just have to react. At least the US government is kind enough to give us plenty of time, the Australians and Brazilians are a different question.

3. Where can you get the JVM patch? Depends on which JVM you are interested in. The IBM link (which doesn't work for me now) would have been discussing IBM's JVM, and it would have told you where to get the updated version. If you're interested in Sun JVMs, then the current Java 1.4 and Java 5 versions already include this change.
Jim Yingst
Wanderer
Sheriff

Joined: Jan 30, 2000
Posts: 18671
vamsikiran, all that changes are the dates at which daylight saving takes effect. If you get an updated JDK from wherever you got your last JDK (e.g. Sun), you should be fine - it will take care of this for you.

[Paul C]: 2. The name of the timezone is "CST". Date formatters will often print "CDT" for dates where daylight saving time is in force, but that's not the name of the timezone. This has also been the case for quite some time.

Mm, I disagree. I guess the exact names may depend on who you ask. But as far as I'm concerned, the name of the time zone is Central Time Zone, and it uses Central Standard time in winter, and Central Daylight time in summer. ("Winter" and "summer" being simplifications, of course.) For the US the relevant authority seems to be nist.gov, and they back up this usage (e.g. here. Java unfortunately uses "Standard Time" in its display names for many time zones, even in summer. But what does Sun know? Fortunately it puts the correct info in formatted time strings. It's just the display name that can't be trusted.

I think it's an error to refer to CST in summer. Misleading, at least. In places where daylight saving is not observed, it's important to be able to correctly identify what time it is. Thus in summer in Arizona (no daylight saving) it may be 10:00 MST, while at the same time in New Mexico (or on the Navajo reservation), it's 11:00 MDT. If a person in New Mexico describes that time as 11:00 MST, they are simply wrong. That's the point of distinguishing between "Standard Time" and "Daylight Saving Time". Admittedly, people in DST-observing states generally can't be trusted to know how to identify the time in summer, but that doesn't diminish our responsibility to refer to the time zone correctly.

Sorry, this is one of those topics I get ranty about. But it's precisely the sort of thing that causes bugs if careful attention is not paid.
[ December 13, 2006: Message edited by: Jim Yingst ]
vamsikiran mallampalli
Greenhorn

Joined: Oct 12, 2006
Posts: 18
Thanks everybody for replying me.I got so much information from you people.Thanks again.
 
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subject: Daylight savings - USA