I completely changed my script , using some examples mentioned used in Crypt::CBC

I believe, this code is working fine for me. But, just wanted to get the confirmation from you guys.

my $start=time();

use Crypt::CBC;
use strict vars;
use strict;
use warnings;

my $key="abcdefgghjkloiuy";

my $cipher = Crypt::CBC->new(-key    =>  $key,
                 -cipher => 'Rijndael',
                 -salt   => 1,
                ) || die "Couldn't create CBC object";
                
open(F,"Robo.mp4");

$cipher->start('encrypting');
  while (read(F,my $buffer,1024)) 
 {
    $cipher->crypt($buffer);
 }
 
 $cipher->finish;
my $end=time();

print "\n".$end-$start;
[download]

IF the code is completely correct, can someone suggest a better way to calculate the time for execution, which also shows the milliseconds too..