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Question: How U.S. and Australia Daylight Saving Time Changes in 2007 affect my Java applications?

Answer: The United States has planned a change to its DST (Daylight Saving Time) at the beginning of 2007.

The DST will start on the second Sunday in March and end on the first Sunday in November.

In 2007, the start and stop dates will be March 11 and November 4, respectively. Observer that these dates are different from previous DST start and stop dates. In 2006 for example, respective dates were the first Sunday in April (April 2, 2006) and the last Sunday in October (October 29, 2006).

The rules about DST observance all around the globe are stored in the Java Runtime Environment (JRE) . Older JREs will have outdated rules and therefore all programs will use wrong time during the short period of time...

Solution: To get correct rules you need to update your JRE from the SUN site. The listed below Java versions have new updated rules:

• JDK 6 Project (beta)
• J2SE 5.0 Update 6 or later
• J2SE 1.4.2_11 or later
• J2SE 1.3.1_18 or later

Look also at Calendar, SimpleDateFormat and GregorianCalendar Java Code examples.

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