+sub mtime
+{
+ my ($self, $year, $thing) = @_;
+
+ my $fn = sprintf "$self->{prefix}/$year/%02d", $thing if $self->{'sort'} eq 'm';
+ $fn = sprintf "$self->{prefix}/$year/%03d", $thing if $self->{'sort'} eq 'd';
+ $fn .= ".$self->{suffix}" if $self->{suffix};
+ return (stat $fn)[9];
+}
+