|January 31, 2007|
What are the 2007 Daylight Saving Time (DST) changes?A:
The U.S. Energy Policy Act of 2005 mandates that, effective as of 2007, Daylight Saving Time (DST) in the United States will begin on the second Sunday of March and end on the first Sunday of November. Before, DST started on the first Sunday of April and ended on the last Sunday of October.
What is affected by the changes?A:
The U.S. system time for operating systems and applications that comply with the old rules will be incorrect. Typically, C and C++ applications obtain the system time through OS system calls; Java applications, through the Java Development Kit (JDK).
Vendors for both the OS and the JDK will release patches with the necessary fixes.
What about the non-U.S. time zones?A:
Canada and Bermuda will follow the U.S. rules. It is recommended that users who reside in the unaffected countries install the related patches anyway. Why? Because applications in those countries could programmatically switch to other time zones to meet application-specific configuration or computation needs; those time zones might well comply with the new DST rules.
Where can I obtain the related OS patches?A:
Where can I obtain the related JDK patches?A:
First, see the BigAdmin DST site and read the article U.S. Daylight Saving Time Changes in 2007 . Go to the following sites for the patches:
How do the DST changes affect Sun Java System Web Server?A:
Sun Java System Web Server (henceforth, Web Server) derives its time informationfor example, the log-file time stampsfrom both the OS system calls and the JDK. In addition, any Java Web applications that run on the Web Server instances and that use the system time information might be affected by the new DST rules. Be sure to apply the appropriate OS patches. Administration Server users must also upgrade the JDK.
Here are the DST-related specifics on the Web Server releases:
How do the DST changes affect Sun Java System Web Proxy Server?A:
Sun Java System Web Proxy Server (henceforth, Web Proxy Server) 3.6.x does not require JRE. Do download the OS patch upgrade, such as that for version 4.0.x, however.
Note: For Web Proxy Server 4.0.x, you need JRE for the Administration Server only.
For Web Proxy Server 4.0.x, upgrade to the upcoming 4.0.4 release, which will ship around the same time as Sun Java Enterprise System 5. Web Proxy Server 4.0.4 bundles DST-compliant JRE 1.4.2_13 on Solaris OS, Windows, and Linux. On HP-UX, Web Proxy Server will be certified with a DST-compliant JRE. For details, see the Web Proxy Server 4.0.4 Release Notes.
Announcements on Web Server 4.0.4 will be posted on the Web Proxy Server Developer Forum and the product site.
As components of Sun Java Enterprise System 5, both Web Proxy Server 4.0.4 and Web Server 7.0 are bundled with a DST-compliant JDK and JRE 1.5, hence not affected by the DST changes.
How do the DST changes affect the Web Server plug-ins and Web applications?A:
The DST changes do not affect the Web Server plug-ins, only Web Server itself. Still, you must download the OS patches. For the Web applications that run on Web Server, download the appropriate JDK.
Do I have to restart the Web Server or Web Proxy Server daemon during an upgrade?A:
Yes, but restart the daemon only after you have applied the OS patches and ensured that the
Finally, some reminders.
Upgrade as follows:
Oracle is reviewing the Sun product roadmap and will provide guidance to customers in accordance with Oracle's standard product communication policies. Any resulting features and timing of release of such features as determined by Oracle's review of roadmaps, are at the sole discretion of Oracle. All product roadmap information, whether communicated by Sun Microsystems or by Oracle, does not represent a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. It is intended for information purposes only, and may not be incorporated into any contract.
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