Templatting HAProxy log name with rsyslog?

I'm trying to set up HAProxy logging with rsyslog, and I currently have HAProxy logs going to a single log file, i.e.:

$AddUnixListenSocket /dev/log

:programname, startswith, "haproxy" {
  /var/haproxy/logs/HAProxy.log
  stop
}

Is there a way to use the current date stamp in the log name? i.e.

$AddUnixListenSocket /dev/log

:programname, startswith, "haproxy" {
  /var/haproxy/logs/HAProxy.%$year%-%$month%-%$day%.log
  stop
}