JS在几小时内收到GMT的两次不同时间问题

Question

我在全球范围内遇到两次截然不同的问题。我需要比较时间格式天：小时：分钟：秒。一切正常，但hour中出现问题。在此示例中，小时应为0小时，但返回6小时。。

function getTimeDiff(join, lastSeen) {

  let t1 = new Date(join).getTime(),
    t2 = new Date(lastSeen).getTime(),
    milliseconds = 0,
    time = '';
  if (isNaN(t1) || isNaN(t2)) return '';
  if (t1 < t2) {milliseconds = t2 - t1;}
  else {milliseconds = t1 - t2;}
  var days = Math.floor(milliseconds / 1000 / 60 / (60 * 24));
  var date_diff = new Date(milliseconds);
  if (days > 0) time += days + 'd ';
  console.log('join: ', join, ' - ', 'lastseen:', lastSeen);
  console.log('Diff = ', milliseconds);
  console.log('Standard Time : ', date_diff);
  console.log('Hours: ', date_diff.getHours());
  console.log('Minutes: ', date_diff.getMinutes());
  console.log('Secounds: ', date_diff.getSeconds());
  if (date_diff.getHours() > 0) time += date_diff.getHours() + 'h ';
  if (date_diff.getMinutes() > 0) time += date_diff.getMinutes() + 'm ';
  if (date_diff.getSeconds() > 0) time += date_diff.getSeconds() + 's ';
  console.log('Result: ', time);
  return time;

}

console.log(getTimeDiff(1589911275699, 1589911365116));

输出结果：

**

1589911275699 " -- " 1589911365116
join:  1589911275699  -  lastseen: 1589911365116
Diff =  89417
Standard Time :  Thu Jan 01 1970 06:01:29 GMT+0600 (Bangladesh Standard Time)
Hours:  6 // Result should be 0
Minutes:  1
Secounds:  29
Result:  6h 1m 29s // 0h 1m 29s

**

Answer 1

当您构造日期对象（new Date(milliseconds)）时，它会在您的时区中创建日期对象（我认为您的格林威治标准时间为+6），因此您可以获得+6小时的时间。