How to check if one DateTime is later than another in javascript

Question

Through the form i am getting two values like

   Start datetime = '01/12/2013 12:00:00 AM' and
   End datetime = '02/12/2013 12:00:00 AM'.

How I can validate the start datetime must be less than end datetime in javascript?

Possible duplicate of [Compare two dates with JavaScript](https://stackoverflow.com/questions/492994/compare-two-dates-with-javascript) — Heretic Monkey, Oct 03 '18 at 12:42

score 50 · Accepted Answer · edited Oct 26 '17 at 13:36

50

Asuming you received a date in Javascript Date format you need Date.parse() function or compare by comparison operators. It will return the milliseconds that have passed since 01/01/1970 00:00

Somehow like this:

if(Date.parse(datetimeStart) < Date.parse(datetimeEnd)){
   //start is less than End
}else{
   //end is less than start
}

Here is a Fiddle

edited Oct 26 '17 at 13:36

gokhanakkurt

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answered Dec 02 '13 at 07:03

Igle

4,572
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1

This assumes that the Date.parse can correctly handle the string it is given. For non US dates or non-ISO dates or user supplied dates, Date.parse can fail to recognise the date delimiters or the date format, so confuse 2/3/21 as 3rd of February (US format) or 2nd Feb (UK format). Either validate and convert to a known format (ie: convert to US/ISO) or use a library like moment.js to handle formatting/conversion. – andora Jun 17 '21 at 16:29

score 10 · Answer 2 · edited May 23 '17 at 11:54

10

its really simple in javascript

var startTime = new Date('01/12/2013 12:00:00 AM');
var endTime = new Date('02/12/2013 12:00:00 AM');

and then all you need to do is compare

if( startTime < endTime){
   alert("start time is lesser");
}

More on this here

edited May 23 '17 at 11:54

Community

1
1

answered Dec 02 '13 at 07:36

Prabhu Murthy

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This assumes that the Date() can correctly handle the string it is given. For non US dates or non-ISO dates or user supplied dates, Date() can fail to recognise the date delimiters or the date format, so confuse 2/3/21 as 3rd of February (US format) or 2nd Feb (UK format). Either validate and convert to a known format (ie: convert to US/ISO) or use a library like moment.js to handle formatting/conversion. – andora Jun 17 '21 at 16:30

score 1 · Answer 3 · edited Apr 30 '14 at 06:04

1

//StartDate & EndDate two dates

if (StartDate < EndDate)
   // code

if you just want the dates, and not the time

if (StartDate.Date < EndDate.Date)
    // code

edited Apr 30 '14 at 06:04

Praveen

53,079
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156

answered Dec 02 '13 at 07:12

Sanjay Nagare

422
2
10

score 1 · Answer 4 · answered Dec 02 '13 at 07:14

1

Try this following code:

function dateCheck() {
    var fDate = new Date("26/05/2013");
    var lDate = new Date("24/05/2013");
    if(fDate <= lDate) {
        alert("true");
        return true;
    }
    alert("false");
    return false;
}

answered Dec 02 '13 at 07:14

Mr.G

3,253
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Karnav Modi · Answer 5 · 2022-04-04T07:02:36.813

1

If you want to compare only dates then this will work.

var dt1 = new Date('12/31/2013');
var dt2 = new Date('12/31/2014');
var dt1obj = Date.parse(dt1);
var dt2obj = Date.parse(dt2);
if(dt2obj <= dt1obj){
//your code here...
}else{
//your code here...
}

edited Apr 04 '22 at 07:02

answered Mar 31 '22 at 09:28

Karnav Modi

21
3

score 0 · Answer 6 · answered Dec 02 '13 at 07:03

var record_day1=fromDate.split("/");
    var sum1=record_day1[1]+'/'+record_day1[0]+'/'+record_day1[2];  
    var record_day2=toDate.split("/");
    var sum2=record_day2[1]+'/'+record_day2[0]+'/'+record_day2[2];  
    var record1 = new Date(sum1);
    var record2 = new Date(sum2); 
    if(record2 < record1)
    {
            alert("End date must be greater than start date");
            return false;
    }

Here we are splitting the date and then combining it for comparing it hope it will work thanks.....:)

score 0 · Answer 7 · answered Dec 02 '13 at 07:15

0

use the date object

    Date1 = new Date('01/12/2013 12:00:00 AM');
    Date2 = new Date('02/12/2013 12:00:00 AM');
    Date1-Date2//in millisecond

answered Dec 02 '13 at 07:15

user3056407

1

score 0 · Answer 8 · edited Jun 26 '20 at 05:33

0

You can use Date.parse as following

if (Date.parse(datetimeStart) < Date.parse(datetimeEnd)) {} else {}

edited Jun 26 '20 at 05:33

Ali

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answered Jun 25 '20 at 13:25

Sachini Witharana

124
6

This assumes that the Date.parse can correctly handle the string it is given. For non US dates or non-ISO dates or user supplied dates, Date.parse can fail to recognise the date delimiters or the date format, so confuse 2/3/21 as 3rd of February (US format) or 2nd Feb (UK format). Either validate and convert to a known format (ie: convert to US/ISO) or use a library like moment.js to handle formatting/conversion. – andora Jun 17 '21 at 16:31

How to check if one DateTime is later than another in javascript

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