Hello Zaxo, Unfortunatelly I don't know how to implement 'last' or 'next', could you please be more specific?
In meantime I have tested a suggestion of a different person so the code now looks like:

#!usr/bin/perl -w

#use strict;
use Fcntl qw[:flock];

my $impressions = 0;
my $iofile = '/other/scripts/daniel/input/c07_impressions_io.info';

open (IO, $iofile) || die("Could not open file 1!");

while (<IO>) {
      chop;
      my ($FH, $output, $file2check, $month, $year) = split (/\s+/, $_
+);

open OUT, ">> $output";

chdir $FH or die "$!";

while (glob $file2check) {
    open FH, $_ or die $!;
    flock FH, LOCK_SH or die $!;
    while (<FH>) {
        chomp;
    if ( / Summary Log \(generated:/ ) {
        print "Found Sumary Log, checking the month and year.\n";
        my($emptyspce, $summary, $log, $generated, $day_word, $monthfi
+le, $day_number, $time, $timezone, $yearfile) = split(/\s+/, $_);
        print "The current file has $monthfile and $yearfile\n";
        print "And I am looging for $month and $year\n";
    if (    $monthfile eq $month
        and $yearfile  eq $year){
        print "File has $yearfile and $monthfile in it. Now Looking fo
+r Impressions.\n";
        my $found = 0;
        until ($found) {
        my $line = <FH>;
          if ($line =~ /Impressions:/ ) {
          $found++;
          print "Found Impressions, now splitting.\n";
          my($text, $value) = split(/:\s*/, $_);
          print  $impressions += $value if ($value =~ /\d+/);
          print "\n";
        }
      }
    }
      }
    }
    close FH or die $!;
  }
}
print OUT 'Total impressions: ', $impressions or die $!;
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And the output I am getting now is:

Found Impressions, now splitting.
Argument "Sat Nov  1 00" isn't numeric in add at c07c_imp.pl line 39, 
+<FH> chunk 13.
0
Found Sumary Log, checking the month and year.
The current file has Nov and 2003)
And I am looging for Nov and 2003)
File has 2003) and Nov in it. Now Looking for Impressions.
Found Impressions, now splitting.
Argument "Sat Nov  1 00" isn't numeric in add at c07c_imp.pl line 39, 
+<FH> chunk 13.
0
Found Sumary Log, checking the month and year.
The current file has Nov and 2003)
And I am looging for Nov and 2003)
File has 2003) and Nov in it. Now Looking for Impressions.
Found Impressions, now splitting.
Argument "Sat Nov  1 00" isn't numeric in add at c07c_imp.pl line 39, 
+<FH> chunk 13.
[download]