const deepClone = (obj) => {
  if (obj === null || typeof obj !== "object") return obj;
  let clone = Array.isArray(obj) ? [] : {};
  for (const key in obj) {
    if (obj.hasOwnProperty(key)) {
      clone[key] =
        obj[key] instanceof Date
          ? new Date(obj[key].getTime())
          : deepClone(obj[key]);
    }
  }
  return clone;
};

// example
// const original = { a: 1, b: { c: new Date() } };
// const clone = deepClone(original);