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Last date 20110101 Bill date 20181205 Data 20110102
Last date 20110101 Bill date 20181205 Data 20110103
...
Last date 20110101 Bill date 20181205 Data 20111030
Last date 20110101 Bill date 20181205 Data 20111030
......

$last_date = <STDIN>;
chomp $last_date;
...
    $return_date = sprintf "%04d%02d%02d", $t[0], $t[1], $t[2];
    return $return_date;
}