DailyRollingFileAppender is writing to previous date file

["MEHMET EMIN CELIK (EBI Bsk. - Analist Programci)" <MC...@THY.COM>]

on start day sistem creates the log file named TASK
writes data continuously on every milisecond
on dayend log4j is closing TASK. renaming the TASK file to TASK.SOMEDATE and
creates new TASK file 
But the new first 3-4 seconds data is written to TASK.SOMEDATE (file is
overrided so we lose all data)
then to the TASK file.

i do not face any problem on NT
problem occurs is on HP-UNIX.
Any idea.

So here is the log4j.prop

log4j.appender.taskFileOut=org.apache.log4j.DailyRollingFileAppender 
log4j.appender.taskFileOut.ImmediateFlush=true
log4j.appender.taskFileOut.Threshold=DEBUG
log4j.appender.taskFileOut.File=${thy.troya.log.dir}/TASK
log4j.appender.taskFileOut.DatePattern='.'yyMMdd'.txt'
log4j.appender.taskFileOut.layout=org.apache.log4j.PatternLayout
log4j.appender.taskFileOut.layout.ConversionPattern= %d{dd HH:mm:ss,SSS}
%m%n


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