I would like to have one of my application's logs use GMT for archive file names. The layout pattern currently supports specifying a time zone (documented under the conversion word 'd' http://logback.qos.ch/manual/layouts.html#conversionWord), but this is not supported when using the %d option with TimeBasedRollingPolicy (http://logback.qos.ch/manual/appenders.html#TimeBasedRollingPolicy) for file naming.