TimeZone is off by one hour

Hi folks,
I use the TimeZone.getDefault() and TimeZone.getTimeZone("America/Los_Angeles") to print the date string. They are both off by one hour and the timezone string is "GMT-08:00" intead of "PDT". The OS is Debian. When I type the date command, it shows "Tue Mar 29 17:56:18 PDT 2011" which is correct. What other settings can be wrong?
Thanks!

The problem must be from the default. The useDayLight is false. I am using Debian, where can I set the right defualt timezone for Java?
TimeZone.getDefault():
sun.util.calendar.ZoneInfo[id="GMT-08:00",offset=-28800000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]
03/30/2011 15:15:14 GMT-08:00
TimeZone.getTimeZone("America/Los_Angeles"):
sun.util.calendar.ZoneInfo[id="America/Los_Angeles",offset=-28800000,dstSavings=3600000,useDaylight=true,transitions=185,lastRule=java.util.SimpleTimeZone[id=America/Los_Angeles,offset=-28800000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=3,startMonth=2,startDay=8,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=3,endMonth=10,endDay=1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]]
03/30/2011 16:15:14 PDT
TimeZone.getTimeZone("GMT"):
sun.util.calendar.ZoneInfo[id="GMT",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]
03/30/2011 23:15:14 GMT

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