Hello Timezone, Brazil/East time changes for Oct1999 and feb 2000 occured for Rule Brazil 1999 only - Oct Sun>=1 0:00 1 D Rule Brazil 2000 only - Feb Sun>=26 0:00 0 S The time is not certain. I have yet to see a governement rule that firmly states at what specific hour to time change is to occur. We have TZ=Brazil/East. The original southamerica file on our system had "Rule Brazil 1988 max - Oct Sun>=15 0:00 1 D" In late September I changed max to only for the 1988 rule and added the 1999 and 2000 rules. But my system only changed to EDT on Sun the 17th of October. I ran ´truss -a -f -wall -vall -rall date´, which revealed that date opens /usr/share/lib/zoneinfo/Brazil/East, but does not open southamerica. After updating the southamerica file do I have to ´rebuild´ the Brazil/East file in some way? Attached is my southamerica file. Cheers, Marcus Chase