_latest("dire1");
...do something...
_latest("dire2");
...do something...
_latest("dire3");
...do something...
_latest("dire4");
...do something...

sub _latest{

 my $file  = shift;
 
 my @dir;
 my $saved_time = -1;
 my $saved_name = '';
 
 sub wanted {
 if(-f $File::Find::name)
 {
  	if ((stat($File::Find::name))[9] > $saved_time) 
 	{
    		$saved_time = (stat($File::Find::name))[9];
    		$saved_name = $File::Find::name;
    	}
 }
 }

 @dir = ($file);
 find(\&wanted, @dir);
 return $saved_name;

}