如何在JavaScript中获取两个日期时间之间的时差？

Question

I want time duration between two date time. I have the start date, start time, end date and end time. Now I have to find the difference between them.

Actually I have tried with this following code, but I got the alert like 'invalidate date'.

function myfunction()
{
    var start_dt = '2013-10-29 10:10:00';
    var end_dt = '2013-10-30 10:10:00';

    var new_st_dt=new Date(start_dt);
    var new_end_dt=new Date(end_dt);

    alert('new_st_dt:'+new_st_dt);
    alert('new_end_dt:'+new_end_dt);

    var duration=new_end_dt - new_st_dt;

    alert('duration:'+duration);
}

the alert msg like as follows:

new_st_dt:invalid date 
new_end_dt: invalid date
duration:NaN

when I run in android simulator I got these alert messages.

Please help me how to get it? How to implement this?

Answer 1

You're passing an invalid ISO date string to that Date() constructor. It needs a form like

YYYY-MM-DDThh:mm:ss

for instance

2013-10-29T10:10:00

So you basically forgot the T to separate date and time. But even if the browser reads in the ISO string now, you would not have an unix timestamp to calculate with. You either can call

Date.parse( '2013-10-29T10:10:00' );  // returns a timestamp

or you need to explicitly parse the Date object , like

var duration=(+new_end_dt) - (+new_st_dt);

---

Further read: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse

Answer 2

Try formatting you timestamps as isoformat so javascript recognizes them. (you put a "T" between the date and time). An example: '2013-10-29T10:10:00'

Answer 3

 function dateDiff(){
var start_dt = '2013-10-29 10:10:00';
var end_dt = '2013-10-30 10:10:00';

var d1= start_dt ;
d1.split("-");
var d2= end_dt ;
d2.split("-");
var t1 = new Date(d2[0],d2[1],d2[2]);
var t2 = new Date(d1[0],d1[1],d1[2]);
var dif = t1.getTime() - t2.getTime();
var Seconds_from_T1_to_T2 = dif / 1000;
return Math.abs(Seconds_from_T1_to_T2);
}