What potential issue could arise from using leading zeros in PHP date formatting?

Using leading zeros in PHP date formatting can potentially cause issues when parsing the date later on, as it may be interpreted as an octal number. To avoid this problem, you can use the 'Y-m-d' format for dates, which does not include leading zeros.

$date = date('Y-m-d', strtotime('2022-01-01'));
echo $date;