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 * Generates an ISO 8601 formatted date string (YYYY-MM-DD) from
 * a Date object.
 * The goal is to return the value of Date.prototype.toISOString
 * without the time portion.
 * (e.g., '2023-03-21T04:15:47.000Z' becomes '2023-03-21')
 * This is useful for setting a date input's min/max values
 * and also for setting date values (e.g., for automated tests).
 * @see
 * @see
 * @see
 * @param {Date} date
 * @returns {string}
const getISOFormattedDate = (date) => {
  // First we need to get the timezone offset in milliseconds.
  // The timezone offset is the difference between the time on
  // the local computer and Universal Coordinated Time (UTC).
  const timezoneOffsetInMinutes = date.getTimezoneOffset();
  const timezoneOffsetInMilliseconds = timezoneOffsetInMinutes * 60 * 1000;

  // Now, let's convert the given date to milliseconds.
  const dateInMilliseconds = Date.parse(date);

  // Calculate the date with the timezone offset and convert to
  // ISO format (e.g., '2023-03-21T04:15:47.000Z').
  const dateWithOffset = dateInMilliseconds - timezoneOffsetInMilliseconds;
  const dateAsISOString = new Date(dateWithOffset).toISOString();

  // Split to return ISO 8601 format (YYYY-MM-DD).
  return dateAsISOString.split("T")[0];

console.log(getISOFormattedDate(new Date()));