Question

当我尝试减去

时

Wed Dec 06 2017 15:58:59 GMT+0530 (India Standard Time)减去Tue Nov 28 2017 00:00:00 GMT+0530 (India Standard Time)，即将到来的答案是 -22

但答案应该是 6

出了什么问题以及在哪里，下面是我的page.ts代码：

  this.tt = new Date();
  this.tt1 = this.datePipe.transform(this.tt,'dd/mm/yyyy');

  console.log(this.ent[0],"server DATE");
  // in console we see this - 28-NOV-17 server DATE

  var firstDate= new Date(this.ent[0]);  //Jan 01 2017 00:00:00

  var secondDate = new Date();//Jan 04 2017 00:00:00

  console.log(firstDate); 
 // answer in console - Tue Nov 28 2017 00:00:00 GMT+0530 (India Standard Time)

  console.log(secondDate);
 //answer in console - Wed Dec 06 2017 15:58:59 GMT+0530 (India Standard Time)

  console.log(secondDate.getDate() - firstDate.getDate() );
 //answer in console -  -22

请告知我如何才能得到理想的结果，谢谢您的时间：）

Answer 1

Date.getDate（）给出＆＃34; dd＆＃34;日期（在你的情况下6和28，解释结果为-22）。我对预期的结果有点困惑是6.所以也许我的答案不适合你。然而，我要做的是及时转换日期，做减法并将其转换回天数。

所以

Math.Floor((secondDate.getTime() - firstDate.getTime()) / 86400000);

(86400000 being 1000 (milliseconds) * 3600 (seconds in an hour) * 24 (number of hours in a day)

Answer 2

您可以将这两个日期转换为时间戳，然后减去您将获得结果天数的时间戳，以毫秒为单位将其转换为天数

getTimestamp(dateParam:string):string{
    var date = new Date(dateParam); // some mock date
    var milliseconds = date.getTime(); 
    return milliseconds.toString();
} 

var one_day=1000*60*60*24;
console.log(Math.ceil(getTimestamp(secondDate) - getTimestamp(firstDate))/(one_day) );

日期减去日期没有给出期望的答案 - IONIC 2

2 个答案: