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Overview Codepages CCSID Bidirectional CCSID DST


The Energy Policy Act of 2005 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 Savings 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. In addition to the U.S., Canada and Bermuda have decided to change their DST dates in 2007 to follow the same time zone rules. For general IBM information on this update refer to the daylight saving time alert page.

i5/OS Updates:

i5/OS has built-in support for time zones. The time zone system value (QTIMZON) specifies the name of the time zone description that is used to calculate local system time. To reflect this DST change in i5/OS, the system simply needs to be told what the new rules are IBM is providing PTFs to update the rules.

The updates for DST for i5/OS are available as:

  • V5R4M0 SI26040 and SI25990
  • V5R3M0 SI26039 and SI25991

These PTFs will automate the changes needed to support the new DST informationfor the following time zone objects that observe DST. Listed are the existing time zones objects and the new replacement objects in base i5/OS, (for more information see the PTF cover letter):

Workaround:
If you do not have the opportunity to install these PTFs you can get the same behavior of the changed DST rules by manually changing your system. See the Daylight Saving Time Manual Instructions section on this page for more information.

Time zone description New 2007 rules
QTIMZON value
Prior  QTIMZON value
Atlantic Time QN0400AST2 QN0400AST
Eastern Time QN0500EST3 QN0500EST
Central Time QN0600CST2 QN0600CST
Mountain Time QN0700MST3 QN0700MST
Pacific Time QN0800PST2 QN0800PST
Alaska Time QN0900AST2 QN0900AST
Hawaii-Aleutian Time QN1000HAS2 QN1000HAST

Note: If you are a customer whose system is in the US, Canada, or Bermuda and you are using another TIMZON value to represent one of the time zones that observe DST in the table above you should change to use the new 2007 value for your location from the list above.

i5/OS Versions prior to V5R3M0:
No update is needed for earlier releases because automatic DST support was added in V5R3M0.

Other updates related to i5/OS:

Java

Java on i5/OS was updated to support this DST change with the following updates:

  V5R2 V5R3 V5R4 Supports new
DST rules for
 
JDK 1.2.2 SI26480
 
5722JV1 Opt 3
(not supported) (not supported) United States
Canada
Bermuda
Western Australia
Yes
Yes
Yes
Yes
JDK 1.3.1 SI25967
 
5722SS1 Opt 3
(default JDK)
SI25968
 
5722JV1 Opt 5
SI25969
 
5722JV1 Opt 5
United States
Canada
Bermuda
Western Australia
Yes
Yes
Yes
Yes
JDK 1.4 SI25966
 
5722JV1 Opt 6
SI26838
 
5722SS1 Opt 3
(default JDK)
SI26839
 
5722SS1 Opt 3
(default JDK)
United States
Canada
Bermuda
Western Australia
Yes
Yes
Yes
Yes
JDK 5.0
64 bit
(not supported) SI26837
 
5722JV1 Opt 7
SI26840
 
5722JV1 Opt 7
United States
Canada
Bermuda
Western Australia
Yes
Yes
Yes
Yes
JDK 5.0
32 bit
(not supported) (not supported) SI24622
 
5722JV1 Opt 8
SR3
United States
Canada
Bermuda
Western Australia
Yes
Yes
No *
No *
* Available with SR4 (SI26811, SI26452), or you can use the tzupatch tool for i5/OS. For more information on the tzupatch tool, refer to the tzupatch page.
For more information about Java's DST support refer to the i5/OS Java Software Technical Document

International Components for Unicode (ICU) 5722SS1 Option 39:
ICU on i5/OS was updated to support this DST change. If you have this option installed you should load the following updates:

  • V5R4M0 SI25400
  • V5R3M0 SI25399
Hardware Management Console (HMC):
The HMC was updated to support this change. Refer to the HMC daylight saving time page for more information.

Other information related to i5/OS:

Flexible Service Processor (FSP):
The FSP is not impacted by this change.

Portable Application Solutions Environment (PASE):
PASE is not impacted by this change (covered by i5/OS support) unless you are explicitly specifying the i5/OS PASE time zone using the TZ or PASE_TZ environment variable. Refer to the PASE daylight saving time page for more information.

iSeries Navigator:
iSeries Navigator is not directly impacted by this change (covered by i5/OS support). However,System i Navigator is among the IBM software that includes a Java Runtime Environment (JRE) that is provided by the IBM Center for Java Technology Development. Third party plug-ins toSystem i Navigator may use the JRE shipped withSystem i Navigator, and you may see DST issues when using them, depending on the Java features they use. If you discover issues, the IBM Center for Java Technology Development has produced a tool to update the Daylight Saving Time (DST) information in the JRE. For instructions on how to update this included JRE, refer to Informational APAR II14264 for more information.