Hi Nicolas, as far as i understand your goal, a RollingFileAppender would do the job. The following appender is an example of a RollingFileAppender, which does a Rollover every hour with de defined name-pattern. The rollover-policy is defined by the time-pattern: <appender name="RollingFile" class="ch.qos.logback.core.rolling.RollingFileAppender"> <File>logFile.log</File> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <FileNamePattern>logFile.%d{yyyy-MM-dd_HH}.log</FileNamePattern> </rollingPolicy> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern> </layout> </appender> cheers Hannes ________________________________ Von: logback-user-bounces@qos.ch [mailto:logback-user-bounces@qos.ch] Im Auftrag von nicolas.giraud@bnf.fr Gesendet: Donnerstag, 30. Oktober 2008 11:09 An: logback-user@qos.ch Betreff: [logback-user] Adding a timestamp to a FileAppender file Hi, I have just switched from log4j to logback. I would like to generate log containing results output by my program, and I want the file name to be SomePrefix.<timestamp>.someExt. I can do this programmatically but I'd like, if possible, to have all my logging configuration in my logback.xml file. Here's the appender I declared : <appender name="resultFile" class="ch.qos.logback.core.FileAppender"> <file>${logFolder}/SomePrefix.%d.someExt</file> <append>false</append> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>info</level> </filter> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern>%m%n</pattern> </layout> </appender> However the %d pattern is not interpreted, is there a way to do this? Maybe using a RollingFileAppender, but I don't see how. Regards, Nicolas Avant d'imprimer, pensez à l'environnement. Consider the environment before printing this mail.