How to find date difference from Date in string format in javascript

Question

I have two dates as From and To in String format as 1/11/2015 and 15/11/2015. What are the ways to find the difference in days between two dates. Remember the dates are in String format not in JavaScript Date format.

you can convert them into Date Object and then compute the diff — gurvinder372, May 26 '16 at 07:09
Look at this:http://stackoverflow.com/questions/5619202/converting-string-to-date-in-js — Samvel Petrosov, May 26 '16 at 07:11
The [`Date(str)`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date) constructor can take a string as an argument and covert it into a date. — Spencer Wieczorek, May 26 '16 at 07:12
new Date('15/11/2015') will give you invalid date. You have to use new Date('11/15/2015'). — Shrabanee, May 26 '16 at 08:03

score 4 · Accepted Answer · answered May 26 '16 at 07:20

You can convert them to dates using

function convertToDate(str)
{
   var dateArr = str.split("/");
   return new Date(dateArr[2], dateArr[1], dateArr[0])
}
var date1 = convertToDate("1/11/2015");
var date2 = convertToDate("15/11/2015");
var diffInDays = (date1.getTime() - date2.getTime())/ (1000*60*60*24);

alert( Math.ceil( Math.abs( diffInDays ) ) );

getTime returns number of milliseconds since 1970, so you need to convert them to days by dividing it with 24 * 60 *60 * 1000 ()

score 0 · Answer 2 · answered May 26 '16 at 07:25

It's actually pretty simple in JS.

Convert the Strings into Unix Timestamps
Get the difference
Convert the difference into days

i.e. in JS

//Since your dates are in DD/MM/YY we have to modify it a bit
var d1 = '1/11/2015'.split('/')
var d2 = '15/11/2015'.split('/')

//This is our converted format that is MM/DD/YY
var normd1 = [d1[1],d1[0],d1[2]].join('/')
var normd2 = [d2[1],d2[0],d2[2]].join('/')

//Get the difference in ms and use the absolute value incase you switched the days
var diff = Math.abs(Date.parse(norm1) - Date.parse(normd2))

//convert the difference to days
var days = diff/(1000*60*60*24 )

Date.parse converts a date string into a millisecond UNIX timestamp, i.e. number of milliseconds since Jan 1, 1970.

Shrabanee · Answer 3 · 2016-05-26T08:06:07.577

0

You can use moment js to achieve your desired result.

var fromDt = new Date("11/1/2015"), toDt = new Date("11/15/2015");
var moment = require('moment');

Convert into millisecond.

var fromDate = moment(fromDt).format('X') * 60000;
var toDate = moment(toDt).format('X') * 60000;

Get the difference.

var diffMs = toDate - fromDate;

Now you can use the desired format you want.

NOTE :- diffMs will give you difference in milliseconds. You can convert it to know the difference.

Hope this will help.

edited May 26 '16 at 08:06

answered May 26 '16 at 07:26

Shrabanee

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Why use a library when it's already supported and simpler in native JavaScript? – Spencer Wieczorek May 26 '16 at 07:30
If you are working with date calculation frequently, it is easier to do it through moment.js. I am using it to do this kind of calcuations. – Shrabanee May 26 '16 at 07:33

score 0 · Answer 4 · answered May 26 '16 at 07:30

Below is the function for mmddyy format of date

function dateDiff(d1,d2){
    var date1 = new Date(d1)
    var date2 = new Date(d2);
    var timeDiff = Math.abs(date2.getTime() - date1.getTime());
    var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
    return(diffDays);
}

The Date function is capable of handling strings. The string should be in a format recognized by the Date.parse() method (IETF-compliant RFC 2822 timestamps and also a version of ISO8601).

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

How to find date difference from Date in string format in javascript

4 Answers4