In 2007, the US has planned a change to it’s daylight savings time schedule. This may cause problems with Java applications (such as Jira and Confluence) that rely on dates and times. The effect of this will be that times reported in Jira or Confluence may be 1 hour off the real time for certain periods in March and November.
The workaround is to ensure that you are running Jira using a JVM that is compliant with the latest daylight savings changes in the US. To find out which JVM your Jira instance is running on, navigate to the System Info page in the Aministration section of your Jira instance. Have a look at the ‘Java Version’ property (in Confluence, the relevant property is called ‘JVM Implementation Version’ also in the System Info page in the Administration section).
If your Java version is the same or above the versions listed below, your Jira/Confluence instance is ready for the US DST changes in 2007. Certain operating systems may also require a patch for this to work correctly. Check with your operating system’s Vendor to see if this is necessary. (There’s an inpcomplete list mentioned here: http://jroller.com/page/bhagvank?entry=day_light_savings_clock_is)
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” (Note that Jira 3.7 and later do not support this JVM. They require 1.4 or later. Confluence has never supported JVM 1.3)
For more details see: http://java.sun.com/developer/technicalArticles/Intl/USDST/
In short, if you upgrade your JVM to the latest release from Sun, you should not experience any problems.
NOTE: If you do not wish to upgrade your JVM, sun has also provided an upgrade tool for existing JVMs, to make them US DST 2007 compliant. You can find more information about this tool here: http://java.sun.com/javase/tzupdater_README.html If you are not running Jira/Confluence on Sun’s JVM, please contact the Vendor of your JVM for more information.

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