Here's a working example of how to get the current time and how to make your Perl script wait a specified amount of time. You should be able to do the rest on your own. :-)

#!/usr/bin/perl -w

use strict;

my    %TRUE_FALSE =
(
    '1'    => 'True',
    '0'    => 'False',
);

my    %DAY_OF_WEEK =
(
    '0'    => 'Sunday',
    '1'    => 'Monday',
    '2'    => 'Tuesday',
    '3'    => 'Wednesday',
    '4'    => 'Thursday',
    '5'    => 'Friday',
    '6'    => 'Saturday',
);

{
    &displayTime();
    &waitAwhile(3);
    &displayTime();
}

exit;

sub displayTime
{
    my $nowsse = time;

    my ($nowsec,$nowmin,$nowhou,$nowdom,$nowmon,$nowyea,$nowdow,$nowdo
+y,$nowdst) = localtime($nowsse);
    $nowyea += 1900;
    $nowmon++;

    print "---------------------------------------------\n";
    my $nowDisplay = sprintf "%04d-%02d-%02d\@%02d:%02d:%02d",
        $nowyea, $nowmon, $nowdom, $nowhou, $nowmin, $nowsec
    ;
    print "  Time right now:  $nowDisplay\n";
    print "     Day of Week:  $DAY_OF_WEEK{$nowdow}\n";
    print "     Day of Year:  $nowdoy\n";
    print "Daylight Savings:  $TRUE_FALSE{$nowdst}\n";
    print "---------------------------------------------\n";

}

sub waitAwhile
{
    my ($waitSeconds, @dummy) = @_;
    if (!defined $waitSeconds) { $waitSeconds = 0; }

    if ($waitSeconds <= 0) { $waitSeconds = 3; }

    print "Waiting $waitSeconds seconds\n";
    sleep $waitSeconds;
}


__END__


C:\Steve\Dev\PerlMonks\P-2013-07-18@1650-Time-Computation>perl timeCom
+putation.pl
---------------------------------------------
  Time right now:  2013-07-18@17:03:10
     Day of Week:  Thursday
     Day of Year:  198
Daylight Savings:  True
---------------------------------------------
Waiting 3 seconds
---------------------------------------------
  Time right now:  2013-07-18@17:03:13
     Day of Week:  Thursday
     Day of Year:  198
Daylight Savings:  True
---------------------------------------------
[download]

Have fun!