one more correction - you have forgot to convert 24hr's 00 hours to 12AM 
sub to12h {
        local $_=shift;

        if (($_ < 0) || ($_ > 23)) {
           return ("$_ is not a valid hour");
        }

        return (12, "AM") if $_ == 0;
        return ($_, "AM") if $_ < 12;
        return ($_, "PM") if $_ == 12;
        return ($_ -12, "PM");
}

for (0..23) {
        print join " ", to12h($_), "\n";
}

[download]

In reply to Re^3: Converting 24 hour time back into 12 hour by Lana
in thread Converting 24 hour time back into 12 hour by Anonymous Monk

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