JavaScript / jQuery: get numeric weekday value of date string

Question

I have a field with a date value that is always formatted as YYYY-MM-DD. How can I get the weekday value of this field value.

Example: If the date in the field is a Monday the result should be 1, if it's Tuesday it should be 2 and so on.

I tried the following but this returns NaN for me:

var n = new Date( $('#myFieldID').val() );
var w = n.getDay();

I am using Moment.js to create the date that goes into that field:

var dateNow = moment().format('YYYY-MM-DD');
$('#myFieldID').val(dateNow);

This works and would fill in 2014-02-13 for the 13th of February 2014.

Many thanks for any help with this, Tim

He said the format it _should_ be in but who knows what's actually being put into that field and as it's omitted it makes the problem infinitely harder than it needs to be. — Kyle Muir, Feb 13 '14 at 01:10
For example: `var n = new Date('2014-01-01'); n.getDay()` n = 3 in any console, so my assumption is that the input is incorrect. — Kyle Muir, Feb 13 '14 at 01:11
I am using Moment.js to create the date that goes into the field. I'll update my post. — user2571510, Feb 13 '14 at 01:19
This question has been tagged with Workday. How this question is related with Workday? — ursitesion, Nov 25 '14 at 21:52

score 1 · Answer 1 · answered Feb 13 '14 at 01:22

1

I used the same exact syntax you did in this JSFiddle.

var n = new Date($('#date').val());
var w = n.getDay();
console.log(w);

Without us knowing what '#myFieldID' is, we can't get the question, but the syntax you used is correct.

answered Feb 13 '14 at 01:22

abustamam

Thanks. I updated my post. My guess is that I need to wrap the date in single quotes or something like that ? – user2571510 Feb 13 '14 at 01:27
1

`var dateNow = moment().format('YYYY-MM-DD'); $('#myFieldID').val(dateNow);` You are missing an endquote for #myFieldID. – abustamam Feb 13 '14 at 01:34
Thanks, that was just the copy / pasting on the site here. – user2571510 Feb 13 '14 at 01:37

score 0 · Accepted Answer · answered Feb 13 '14 at 02:07

0

I found out that Moment.js also has a weekday function built-in which resolved the issue. Thanks.

answered Feb 13 '14 at 02:07

user2571510

2 Answers2