# Implicitly write a number, the leading zero is removed: 1209
$worksheet->write('A1', '01209');
# Write a zero padded number using a format: 01209
my $format1 = $workbook->add_format(num_format => '00000');
$worksheet->write('A2', '01209', $format1);
# Write explicitly as a string: 01209
$worksheet->write_string('A3', '01209');
# Write implicitly as a string: 01209
$worksheet->keep_leading_zeros();
$worksheet->write('A4', '01209');
# これが正解
# Format as a string (01209)
my $format2 = $workbook->add_format(num_format => '@');
$worksheet->write_string('A5', '01209', $format2);