This may be trivial, but it is handy when you have to mark the version of a script running on various output, particularly when there are a number of processes and a great deal of data--- providing the thicket to get lost in!

#!/usr/bin/perl
# ttime.pl --
use strict;
use warnings;
use diagnostics;
use feature ":5.10";
use autodie;
use version 0.77;
use Data::Dumper::Simple;

our $VERSION = '0.042';

#
# variations on a theme as needed (not by Thomis Talis)
#
#sign_on();
#sign_on(*STDOUT);
#my $fh;
#open($fh,'>','ttime.log');
#sign_on($fh);
#
# NOTE: this will leave the program extension on to differentiate
# between running under cygwin/unix where I typically strip off the
# extension (cuts down on typing) as compared to a dos box where I
# don't have to type the extension and therefore leave it alone...
#

sign_on();

sub sign_on {
    my $out = @_ ? shift : *STDERR;
    my $date = localtime();
    (my $program = $0) =~ (s/.*(?:\/|\\)(.*?..*$)/$1/);
    my $version = version->parse($VERSION);
    print $out "$program v$version, $date\n";
}
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Ignore the stupid program title and the use Data::Dumper::Simple; it is part of my template based boiler plate...