Get day from Date in JavaScript

Question

I want to get day from date. Suppose my date is 03-08-2013 it is in d-mm-yyyy format so I just want to get dand that is 03 from above date so I try this code but it does not work

Note I want to do it without including any js

var date = '08-03-2013';
var d = new Date(date);
alert(d.getDate());
// 2nd way
alert(date.getDate());

it alert NaN. What is missing in this code? here is jsfiddel Link Jsfiddle Link

UPDATE

your `data` var is of type `String` not `Date`, You cannot call `getDate()` method on type `String` — fujy, Sep 01 '13 at 12:55
@putvande `new Date('03-08-2013')` doesn't parse the date correctly so it won't return what's expected. — JJJ, Sep 01 '13 at 13:01
@putvande `d.getDate()` gives me `8` which is the month, not the day. — André Dion, Sep 01 '13 at 13:01
What date is it you are looking for? The 3rd of August or the 8th of March? Because you are getting the 8th of March with your code. Your format needs to be `mm-dd-yyyy`. — putvande, Sep 01 '13 at 13:03
@putvande No. It should be an [RFC2822 or ISO 8601 date](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse). `mm-dd-yyyy` won't work reliably cross-browser. — JJJ, Sep 01 '13 at 13:07

score 2 · Accepted Answer · answered Sep 01 '13 at 13:07

Date parsing in JS (and many languages, for that matter) is problematic because when the input is a date string, it's fairly ambiguous what piece of data is what. For example, using your date (August 3, 2013) it could be represented as

03-08-2013 (dd-mm-yyyy)
08-03-2013 (mm-dd-yyyy)

However, given just the date string, there's no way to tell if the date is actually August 3, 2013 or March 8, 2013.

You should pass your date values independently to guarantee the date is correctly parsed:

var
    str = '08-03-2013',
    parts = str.split('-'),
    year = parseInt(parts[2], 10),
    month = parseInt(parts[1], 10) - 1, // NB: month is zero-based!
    day = parseInt(parts[0], 10),
    date = new Date(year, month, day);

alert(date.getDate()); // yields 3

MDN documentation for Date

Since when is month zero-based? – Hexodus Aug 14 '20 at 16:45 — Hexodus, Aug 14 '20 at 16:45

score 2 · Answer 2 · answered Sep 02 '13 at 03:12

2

Use moment.js. It's parsing ability is much more flexible than the Date class.

var m = moment('03-08-2013','DD-MM-YYYY');
var dayOfMonth = m.date();

answered Sep 02 '13 at 03:12

Matt Johnson-Pint

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score 1 · Answer 3 · answered Sep 01 '13 at 13:06

You can't know the regional settings of your visitors.

If you know the format of the string is always d-mm-yyyy then just parse the value yourself:

function GetDay(rawValue) {
    var parts = rawValue.split("-");
    if (parts.length === 3) {
        var day = parseInt(parts[0], 10);
        if (!isNaN(day))
            return day;
    }
    alert("invalid date format");
    return null;
}

Live test case.

Sarwar Hasan · Answer 4 · 2013-09-01T13:33:24.367

0

Use this it that which you want..

var date = '08-03-2013';
date=date.replace(/([0-9]{2})\-([0-9]{2})\-([0-9]{4})/g, '$3-$2-$1');
var d = new Date(date);   
alert(d.getDate());

Thanks

edited Sep 01 '13 at 13:33

answered Sep 01 '13 at 13:01

Sarwar Hasan

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I don't know who down-voted this but it works in my end.. alert shows 8 – Sarwar Hasan Sep 01 '13 at 13:06
Yep, but OP is looking for 3, not 8. – putvande Sep 01 '13 at 13:07
but i shows the format in comment at right if s/he follow that then s/he will get right value.. that is //yyyy-mm-dd – Sarwar Hasan Sep 01 '13 at 13:08
@SarwarCSE this works but what if my format is dd-mm-yyyy?then this will not work btw vote up for this effort – Azam Alvi Sep 01 '13 at 13:14
1

@AzamAlvi You shouldn't "upvote for effort" if the answer is incorrect. – André Dion Sep 01 '13 at 13:22
@Azam Alvi I have updated for format dd-mm-yyyy. please check that – Sarwar Hasan Sep 01 '13 at 13:28
SarwarCSE good job.Now it's work great.If @André Dion dont post his answer I must accept this answer. – Azam Alvi Sep 01 '13 at 13:39

Get day from Date in JavaScript

4 Answers4