The Energy Policy Act of 2005 changed when daylight saving time (DST) begins and ends in the United States, starting in 2007. This could be the Year 2000 Problem all over again. As discussed in "Daylight-saving switch may cause tech woes," lots of electronics from VCRs to Microsoft Windows ("Preparing for Daylight Saving Time changes in 2007") calculate DST and will need to be patched.
The problem affects Java, specifically the JRE, and the apps that run in Java and depend on the current time. See "U.S. Daylight Saving Time Changes in 2007."
IBM has a number of support documents on how to handle this problem:
- URGENT! Actions Required: Changes to Daylight Saving Time will affect IBM WebSphere Application Server and its associated Operating Systems (Reference #: 1219396)
- Effects of 2007 Daylight Saving Time (DST) changes on IBM WebSphere Portal (Reference #: 1245600)
- US Daylight Saving - How the changes to daylight saving time dates affect Broker Products (Reference #: 1246615)
- Possible implications if one does not apply the Daylight Saving Time fixes (Reference #: 1246846)
Apparently Australia has/had a similar problem in 2006: Eastern Australia: Fixes available for Java applications that are impacted by the change to daylight savings time dates (Reference #: 1232128)
Nov 7 Update: Guy Bowerman addresses the DST issue for other IBM SWG products in Extended daylight savings time - should Informix DBAs care?