Javascript:计算今天和特定工作日之间的时间

Question

我正在寻找一种方法来计算从现在UTC-7到下个星期六(独立于日期进行计算)在特定的UTC-7时间(08:00)在Javascript之间的时间(秒)。

目前我正在使用这个代码，但是我想用上面提到的计算方法来代替给出具体的日期：

// Grab the current date
var now = new Date();
var currentDate = new Date(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),  now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds()); currentDate.setHours(currentDate.getHours() - 7);

// Set some date in the future. 
var ClashDate  = new Date("August 6, 2017 16:40:00");
var BashDate  = new Date("August 12, 2017 08:00:00");

// Calculate the difference in seconds between the future and current date
var diffclash = ClashDate.getTime() / 1000 - currentDate.getTime() / 1000;
var diffbash = BashDate.getTime() / 1000 - currentDate.getTime() / 1000;

有谁能帮帮我吗？

您诚挚的Yamper

Answer 1

为简单起见，您可以使用MomentJS动态计算出下一个Saturday和下一个Saturday的日期。

要为即将到来的Saturday实例化一个Moment日期，可以通过.day(int)应用编程接口来实现。例如，.day(6)。

要获得epoch时间，您可以执行.unix()，但这里有一个问题。默认情况下，它返回的是从epoch开始的seconds，而不是标准毫秒。

示例：

​

var now = new Date();
var currentDate = new Date(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(),  now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds()); currentDate.setHours(currentDate.getHours() - 7);

moment().tz("America/New_York").format();

// Set some date in the future.
var ClashDate = moment().day("Saturday").hour(16).minutes(40).seconds(0);
var BashDate = moment().day(13).hour(8).minutes(0).seconds(0);

console.log("Next Saturday date is => " + ClashDate.toString());
console.log("Next Next Saturday date is => " + BashDate.toString());

// Calculate the difference in seconds between the future and current date
var diffclash = ClashDate.unix()  - currentDate.getTime() / 1000;
var diffbash = BashDate.unix() - currentDate.getTime() / 1000;

console.log("diffClash => " + diffclash);
console.log("diffBash => " + diffbash);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.13/moment-timezone-with-data.min.js"></script>

​

参考：

MomentJS - https://momentjs.com/docs/

Answer 2

在POJS中，(单向的)你可以在特定的时间获得下一个星期六，如下所示。

​

function nextSaturday(date) {
  const d = date ? new Date(date) : new Date();
  d.setDate(d.getDate() + (6 - d.getDay()) % 7);
  return new Date(`${d.toISOString().split('T').shift()}T14:00:00.000Z`);
}

console.log(nextSaturday('2017-08-13'));
console.log(nextSaturday('2017-08-31'));
console.log(nextSaturday());

​