js 格式化带时区的日期

/**
 * 格式化带时区的日期
 */
function formatDate(date) {
  var arr = date.split("T");
  var d = arr[0];
  var darr = d.split('-');
  var t = arr[1];
  var tarr = t.split('.000');
  var marr = tarr[0].split(':');
  var dd = parseInt(darr[0]) + "/" + parseInt(darr[1]) + "/" + parseInt(darr[2]) + " " + parseInt(marr[0]) + ":" + parseInt(marr[1]) + ":" + parseInt(marr[2]);
  return formatDateTime(dd);
}

function formatDateTime(date) {
  let time = new Date(Date.parse(date));
  time.setTime(time.setHours(time.getHours() + 8));
  let Y = time.getFullYear() + '-';
  let M = addZero(time.getMonth() + 1) + '-';
  let D = addZero(time.getDate()) + ' ';
  let h = addZero(time.getHours()) + ':';
  let m = addZero(time.getMinutes()) + ':';
  let s = addZero(time.getSeconds());
  return Y + M + D;
}
function addZero(num) {
  return num < 10 ? '0' + num : num;
}