graff and liverpole have given you some useful pointers. I would like to draw your attention to what I think is a fault with your calculation of AM/PM. On a 24-hour clock the hours of 0 through 11 are AM and 12 through 23 are PM. Your code should perhaps read

$ampm = 'AM';
if ($hour >= 12)
{
    $hour -= 12;
    $ampm = 'PM';
}
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Also, when you are constructing your $datetime string you could construct the whole thing in one go with the sprintf. Note that %02d will do the same thing here as %2.2d.

$datetime = sprintf
   '%d:%02d:%02d %s, %s, %s %d, %d',
   $hour, $min, $sec, $ampm,
   $thisday, $thismon, $mday, $year + 1900;
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This looks a little clearer to my eye, particularly the format string which makes it much easier to visualise what the $datetime string will look like.

I hope this is of use.

Cheers,

JohnGG

Update: It occurs to me that 00:23 on a 24-hour clock is 12:23AM, not 0:23AM and 12:23 on a 24-hour clock is 12:23PM, not 0:23PM so revised code should in fact be

$ampm = 'AM';
if ($hour >= 12)
{
    $hour -= 12;
    $ampm = 'PM';
}
$hour += 12 unless $hour;
[download]