如何在JavaScript中计算X天前

Question

在我的应用程序中，我正在访问远程URL并获得如下所示的JSON响应。JSON响应具有名为的属性created_at。

在JavaScript中，我需要获取当前日期减日期（-），created_at然后计算创建注释的天数。

我怎样才能做到这一点？

{  
   "id":12578834,
   "title":"Joint R&D Has Its Ups and Downs",
   "url":"http://semiengineering.com/joint-rd-has-its-ups-and-downs/",
   "num_points":1,
   "num_comments":0,
   "author":"Lind5",
   "created_at":"9/26/2016 2:28"
}

Answer 1

您可以创建天数，然后减去来获得差值today.getTime() - date.getTime()/NumOfMSecInDay。

另外，时间部分可能会引起一些问题，因此最好将其剥离。

var d = {
  "id": 12578834,
  "title": "Joint R&D Has Its Ups and Downs",
  "url": "http://semiengineering.com/joint-rd-has-its-ups-and-downs/",
  "num_points": 1,
  "num_comments": 0,
  "author": "Lind5",
  "created_at": "9/26/2016 2:28"
}

var today = new Date();
var createdOn = new Date(d.created_at);
var msInDay = 24 * 60 * 60 * 1000;

createdOn.setHours(0,0,0,0);
today.setHours(0,0,0,0)

var diff = (+today - +createdOn)/msInDay
console.log(diff)