JS function to generate a Java ZonedDateTime

zdt.js

const pad = (value) => {
  return value < 10 ? '0' + value : value;
}

const createOffset = (date) => {
  const sign = (date.getTimezoneOffset() > 0) ? "-" : "+";
  const offset = Math.abs(date.getTimezoneOffset());
  const hours = pad(Math.floor(offset / 60));
  const minutes = pad(offset % 60);
  return sign + hours + ":" + minutes;
}

const createZonedDateTime = (date = new Date()) => {
  return date.getFullYear() + "-" + pad(parseInt(date.getMonth(), 10) + 1) + "-" + pad(date.getDate()) + "T" + pad(date.getHours()) + ":" + pad(date.getMinutes()) + ":" + pad(date.getSeconds()) + createOffset(date) + "[" + Intl.DateTimeFormat().resolvedOptions().timeZone + "]";
};

Should return a JVM-formatted ZonedDateTime string using the brower's timezone via Intl (e.g., "2023-04-04T14:48:26-05:00[America/Chicago]").