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字符串转Date对象

方法一​

// 字符串转日期对象
// 传入时间例如：20211212
// 导出时日期： Sun Dec 12 2021 08:00:00 GMT+0800 (中国标准时间)
function dateStringToDate(dateString) {
  try {
    var year = dateString.substring(0, 4);
    var month = dateString.substring(4, 6);
    var day = dateString.substring(6, 8);
    var date = new Date(year, month - 1, day);
    const offset = date.getTimezoneOffset()
    date = new Date(date.getTime() - (offset * 60 * 1000));
    return date;
  } catch (error) {
    return null;
  }
}

方法二​

// 字符串转日期对象
// 传入时间例如：20211212
// 导出时日期： Sun Dec 12 2021 08:00:00 GMT+0800 (中国标准时间)
var dateString  = "20211212";
var year        = dateString.substring(0,4);
var month       = dateString.substring(4,6);
var day         = dateString.substring(6,8);

var date        = new Date(year, month-1, day);
var currentDate = new Date();

链接​

Convert Returned String (YYYYMMDD) to Date