This post originated from an RSS feed registered with Java Buzz by Weiqi Gao. Original Post: Is Your JDK US-DST-Change-Ready? Feed Title: Weiqi Gao's Weblog Feed URL: http://www.weiqigao.com/blog/rss.xml Feed Description: Sharing My Experience... Latest Java Buzz Posts Latest Java Buzz Posts by Weiqi Gao Latest Posts From Weiqi Gao's Weblog

(Via someone from London)

Simon Brown: The US are changing the dates when daylight savings come into effect and, since the logic for calculating these dates is built-in to the Java runtime, your applications might be affected. Basically, you need to upgrade your Java runtime environment and further details about this can be found at U.S. Daylight Saving Time Changes in 2007.

The link Simon provided gives a lot of information about the implementation details of how time zones are handled. I spent about 15 minutes just reading and following internal links to find the information relevant to me (JDK 1.5.0_10). Here's what I found:

• When were the US-DST 2007 Changes announced?
• They were announced under the title U.S. Energy Policy Act of 2005.
• The US-DST changes for 2007 were codified in Olson dataset 2005n.
• The 2005n changes were incorporated into the Java SE platform updates 1.3.1_18, 1.4.2_11, 5.0u7.

and

• Which versions of the Java SE platform are already USA 2007 DST ready?
• Java SE 6 FCS is USA 2007 DST "ready"
• Java SE 5.0 u6 and above are USA 2007 DST "ready"
• Java SE update release v1.4.2_11 and above are USA 2007 DST "ready"
• Java SE update release v1.3.1_18 and above are USA 2007 DST "ready"

It looks like I'm OK.