Question

我有这个代码根据用户计算机的时间计算直到午夜CST的毫秒数。
对于我所在的时区，now.getTimezoneOffset()返回420，使tmzOfst为60。

function millisToMidnight() {
  var now = new Date();
  var tmzOfst = (now.getTimezoneOffset())-360; //-360 minutes = CST
  now.setHours(-(tmzOfst/60));// Adjust 'now' to CST time
  var then = new Date(now);   //make a var same as now
  then.setHours(24, 0, 0, 0); //set to midnight
  return (then - now);        //calculate difference
}

然而，当我运行它（console.log＆＃39;无处不在）时，我明白了：

Now = Tue Mar 07 2017 21:51:05 GMT-0700 (Mountain Standard Time) 
tmzOfst = 120
Then = Mon Mar 06 2017 22:51:05 GMT-0700 (Mountain Standard Time)

正如您所看到的，正确地将时间更改为CST，但是，它最终也会更改日期。有更简单的方法吗？为什么它会改变这一天？

Answer 1

如果你想调整小时数，你需要调整，而不是SET

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Answer 2

这应该给你午夜的毫秒数。

state

科学技术委员会午夜时间？

2 个答案: