Dear all, I was trying to modify the tzdatabase ($JRE_HOME/lib/zi/*) for JRE, but could not make it sucess. Here is what I have done so far... 1. Downloaded the code and latest tzdata from ftp://elsie.nci.nih.gov/pub/. 2. Modified the asia file and insert my rule there. 3. compile the file with zic. 4. copy the compiled file and put in in $JRE_HOME/lib/zi/Asia/ of my windows pcs 5. run the DSTTest file available in sun.com to check the time zone and got following error C:\Program Files\Java\jre1.5.0_06\bin>java DSTTest "12/30/2009 1:00 AM" ZoneInfo: wrong magic number: Asia/Dhaka ZoneInfo: wrong magic number: Asia/Dhaka JRE version : 1.5.0_06 Wed Dec 30 01:00:00 GMT 2009 TimeZone tested : Greenwich Mean Time Your tested time is not in daylight-savings time. C:\Program Files\Java\jre1.5.0_06\bin> Please help me. Mamun