javascript操作unix时间戳10位转换成通用时间

javascript操作unix时间戳10位转换成通用时间（yyyy-MM-dd HH:mm:ss）

//时间戳转换成通用时间
function js_date_time(unixtime) {
  var dateTime = new Date(parseInt(unixtime) * 1000)
  var year = dateTime.getFullYear();
  var month = dateTime.getMonth() + 1;
  var day = dateTime.getDate();
  var hour = dateTime.getHours();
  var minute = dateTime.getMinutes();
  var second = dateTime.getSeconds();
  var monthStr = month;
  if (month < 10)
    monthStr = "0" + month;
  var dayStr = day;
  if (day < 10)
    dayStr = "0" + day;
  var hourStr = hour;
  if (hour < 10)
    hourStr = "0" + hour;
  var minuteStr = minute;
  if (minute < 10)
    minuteStr = "0" + minute;
  var secondStr = second;
  if (second < 10)
    secondStr = "0" + second;
  var now = new Date();
  var now_new = Date.parse(now.toDateString()); //typescript转换写法
  var milliseconds = now_new - dateTime;
  var timeSpanStr = year + '-' + monthStr + '-' + dayStr + ' ' + hourStr + ':' + minuteStr + ':' + secondStr;
  return timeSpanStr;
}