Try this modified code. Procedures don't have to return values but I have done it in these examples to show the procedure is being executed.

#!perl
use strict;
use DBD::Oracle;
use DBD::Oracle qw(:ora_types);

runNoReturn("BEGIN NULL; END;");

runAndReturn("BEGIN :out := CONCAT('Hello ',USER) ; END;");
runAndReturn("BEGIN :out := CURRENT_DATE ; END;");
runAndReturn("
  BEGIN
    :out := TO_CHAR (SYSDATE, 'DD-MON-YYYY HH24:MI:SS'); 
  END;");

sub runNoReturn { 
  my $procT = shift;
  my $dbh1=DBI->connect(
    'dbi:Oracle:host=localhost;sid=xe','user','pwd', 
    {RaiseError => 1 , PrintError => 0} );     
   
  $dbh1->do($procT);   
  $dbh1->disconnect; 
  print "Anon $procT finished\n";
} 

         
sub runAndReturn { 
  my $procT = shift;
  my $dbh1=DBI->connect(
    'dbi:Oracle:host=localhost;sid=xe','user','pwd', 
      {RaiseError => 1 , PrintError => 0} );     
   
  my $out  = '';   
  my $sth1 = $dbh1->prepare($procT); 
   
  $sth1->bind_param_inout(":out",\$out,50,{ora_type => ORA_VARCHAR2});
  $sth1->execute;
  $dbh1->disconnect; 
  print "$out\n";
}
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poj