Hi sandy105,

you might want to try this: 

use strict;
use warnings;

my ($tot1, $tot2);
while (<DATA>) {
    chomp;
    s/\s+$//g;
    next unless /TP Service Request$/ or /P5 Move request$/;
    my ($datetime, $ms, $inid, $message) = split /,/, $_;
    my $date = substr $datetime,11;
    my ($hours, $min, $sec) = map { $_ * 1000} split /:/, $date;
    $hours *= 60 * 60;
    $min *= 60;
    my $total_time = $hours + $min + $sec + $ms;
    $tot1 = $total_time if $message eq "TP Service Request";
    $tot2 = $total_time if $message eq "P5 Move request";
    next unless defined $tot2;
    print "Duration is: ", $tot2 - $tot1, " ms.\n";
    last;
}
        

__DATA__
2014-05-29 10:22:21,880,165ab6a8-e736-11e3-8748-8d365226be24,TP Servic
+e Request 
2014-05-29 10:22:21,962,165ab6a8-e736-11e3-8748-8d365226be24,ProcessNa
+me: TC 
... (rest of data omitted from this post for brevity)

[download]
Executing it gives the following: 
$ perl  log_files.pl
Duration is: 46426 ms.

[download]
There are some issues left. For example, this does not work correctly if the date changes between the two dates/times. Please note that I have also tried to make the code more "DRY" (Don't Repeat Yourself).

In reply to Re: processing timelog by Laurent_R
in thread processing timelog by sandy105

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