Formats a number with leading zeros so the resulting string is 4 digits long.
Similar to string.padStart(4, '0') but will also format
negative numbers similar to how the JavaScript date formats
negative year numbers (e.g. -37 is formatted as -000037).
Formats a number with leading zeros so the resulting string is 4 digits long. Similar to
string.padStart(4, '0')but will also format negative numbers similar to how the JavaScript date formats negative year numbers (e.g.-37is formatted as-000037).