Javascript converting YYMMDD formatted string into date object

Question

This is probably a trivial question, but I'm trying to look for the most efficient way to do this.

I am given a string in this format "20130914" from a servlet and I need to create a javascript date object from it.

From what I know, date object accepts ISO format for strings so I need to append dashes in between my year,month and date like this "2013-09-14"

I could use .splice function to insert dashes in between the year,month and date but I feel like there has to be an easier solution for this trivial question. Or am I overthinking this?

I think, as you mentioned, you have to parse the string yourself. like.. var year = mydatestr.substring(0,4) — mconlin
– mconlin, Commented May 23, 2013 at 2:28

Benjamin Gruenbaum · Accepted Answer · 2013-05-23 02:28:30Z

3

What you're doing is fine, there is no big problem in writing simple code to do common tasks.

If you find yourself performing a lot of date calculations momentjs is a very small (5kb) library that handles dates just like that.

For example, what you need in moment can be written as:

moment("20130914", "YYYYMMDD");

answered May 23, 2013 at 2:28

Benjamin Gruenbaum

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1 Comment

TtT23 Over a year ago

Yes, I'll be handling a lot of date calculations. Thanks for recommending a great library.

Isaac · Accepted Answer · 2013-05-23 02:29:45Z

3

Because I am in love with regex:

var rawDate = '20130914';
console.log(new Date(rawDate.replace(/(\d{4})(\d{2})(\d{2})/,"$1-$2-$3")));
//Output: Sat Sep 14 2013 12:00:00 GMT+1200 (New Zealand Standard Time)

answered May 23, 2013 at 2:29

Isaac

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RobG · Accepted Answer · 2019-09-20 00:38:21Z

1

Using plain and simple JS:

var input = "20130914";
var date = new Date(input.substr(0, 4), input.substr(4, 2) - 1, input.substr(6, 2));
console.log(date.toString());

edited Sep 20, 2019 at 0:38

RobG

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answered May 23, 2013 at 2:38

Claus

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RobG · Accepted Answer · 2019-09-20 00:42:52Z

0

Rather than parsing a string to create another string to be parsed by the built–in parser, you can get the parts and give them directly to the Date constructor:

let s = '20130914';

// Parse string in YYYYMMDD format to Date object
function parseYMD(s) {
  let b = s.match(/\d\d/g);
  return new Date(b[0]+b[1], b[2]-1, b[3]);
}

console.log(parseYMD(s).toString());

answered Sep 20, 2019 at 0:42

RobG

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