How should I update a Debian system so java programs know about the
new Daylight Saving Time rules in the US?
I know about the OS data files:
For a Linux box, you can check particular dates this way:
vanzandt:~$ date --date="10 March 2007 15:00 UTC"
Sat Mar 10 10:00:00 EST 2007
vanzandt:~$ date --date="11 March 2007 15:00 UTC"
Sun Mar 11 11:00:00 EDT 2007
This prints DST transitions:
zdump -v `cat /etc/timezone`|egrep '(2006|2007)'
On a testing or unstable system, the relevant data files are in the
tzdata package.
However, java doesn't trust the OS to get time zone and DST
calculations right, so it has to be updated separately.
To check it, I downloaded TimeTest.jar from IBM:
http://www-1.ibm.com/support/docview.wss?rs=3068&uid=swg21251761#validation
sphinx:~/admin$ java -classpath . -jar TimeTest.jar
...
Western Australia 2006 (tested against Australia/Perth): Update not
included
Brazil 2006 (tested against America/Sao_Paulo): Update not included
US 2007 (tested against America/New_York): Update not included
Canada 2007 (tested against America/Vancouver): Update not included
Bermuda 2007 (tested against Atlantic/Bermuda): Update not included
Bahamas 2007 (tested against America/Nassau): Update not included
...
I also tried CheckDST from
http://www.theserverside.com/tt/articles/article.tss?l=CountdownDST2007
sphinx:~/admin$ javac CheckDST.java
sphinx:~/admin$ java CheckDST
Testing JRE TimeZone DST transitioning for: PST
FAILURE for DST entry date 03/11/2007
FAILURE for DST exit date 11/04/2007
I have one system with kaffe (kaffe_2%3a1.1.5-3_all.deb) and another
with gij (gij-4.1_4.1.1-9_i386.deb), but both fail these tests.
Are updates available? Should I just use TZupdater from Sun?
http://java.sun.com/javase/tzupdater_README.html
- Jim Van Zandt
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