Format date into US format with `-` instead of `/`: mm-dd-yyyy

formatter.js

const now = new Date();
const options = {
  timeZone: 'UTC',
  day: '2-digit',
  month: '2-digit',
  year: 'numeric'
};
const formatter = new Intl.DateTimeFormat("en-US", options);

// mm-dd-yyyy with no library
formatter
  .formatToParts(now)
  .map(({ type, value }) => {
    if (type === "literal") return "-";

    return value;
  })
  .join('')