在javascript (GAS)中将字符串转换为多维数组中的日期时出现问题

var dateString = "2022-01-01";
var date = new Date(dateString);

var array = [["2022-01-01", "2022-01-02"], ["2022-01-03", "2022-01-04"]];
for (var i = 0; i < array.length; i++) {
  for (var j = 0; j < array[i].length; j++) {
    array[i][j] = new Date(array[i][j]);
  }
}

var array = [[1640995200000, 1641081600000], [1641168000000, 1641254400000]];
for (var i = 0; i < array.length; i++) {
  for (var j = 0; j < array[i].length; j++) {
    var date = new Date();
    date.setTime(array[i][j]);
    array[i][j] = date;
  }
}