[syslog-ng] filter by date?

[scarter at micron.com]

hello,
 
Is it possible to setup up a filter match based on variables for date?
example thinking...
 
filter f_date { match($YEAR-$MONTH-$DAY.*); };
 
#log the files
log { source (s_udp); filter(f_date); destination(messages); };

# set it up
destination hosts {
        file("/syslog/NT-SYSLOG/HOSTS/$HOST/$MONTH-$DAY-$YEAR"
                owner(root) group(root) perm(0644) dir_perm(0755)
create_dirs(yes)
        );
};

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