[syslog-ng] syslog-ng.conf configuration for log files every 15 minutes

Hi, Currently, I have used the syslog-ng.conf to setup hourly files using the following config - destination d_clicks {file("/var/log/local-pid$PID-click-$YEAR-$MONTH-$DAY-$HOUR.log");}; Is there a way I could get files every 15 minutes? Best, Akshay