Can I create a Date object from a predefined string (typescript)?

Question

I have a value returned in a string (numbers separated by commas) and I'd like to make a Date object out of it. It looks like this is not possible, can someone confirm and/or suggest me a solution.
This does not work :

let dateString='2017,3,22,0';
let dateFromString = new Date(dateString);

This works though (when I pass a list of numbers) :

let dateFromString = new Date(2017,3,22,0);

And this works also :

let dateString = '2008/05/10 12:08:20';
let dateFromString = new Date(dateString);

The goal would be to create a Date object from a uniform string. Is that possible ?

Can I create a Date object from a predefined string, which has only one type of separator (comma, colon, slash or whatever) ?

updated question. can i create a date object from a predefined string which uses only one character as separator ? — magor
– magor, Commented Mar 28, 2017 at 14:14
And what exactly uniform string do you want to use - 2017,3,22,0 or 2008/05/10 12:08:20? — hindmost
– hindmost, Commented Mar 28, 2017 at 14:14
I want to avoid using , and : both as separator. I would like to use only one certain character as separator, either ,, : or / or whatever. — magor
– magor, Commented Mar 28, 2017 at 14:17

Community · Accepted Answer · 2017-05-23 10:30:09Z

1

If your environment is compatible with ES6 (eg. Babel, TypeScript, modern Chrome/Firefox etc), you can use the string's .split(',') and decompose the array into arguments like the following:

const dateString = '2017,3,22,0';
const date = new Date(...dateString.split(','));  // date object for 2017/03/22

ES5 compatible version:

var dateString = '2017,1,2,0';
var date = new (Function.prototype.bind.apply(Date, [null].concat(dateString.split(','))));

As for how the .bind.apply method works with new, you can take a look at Use of .apply() with 'new' operator. Is this possible?

Note: Thanks to the two comments below for spotting my errors 👍

edited May 23, 2017 at 10:30

CommunityBot

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answered Mar 28, 2017 at 14:13

Liam Gray

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7 Comments

hindmost Over a year ago

const is not compatible with ES5

abhishekkannojia Over a year ago

It should be new (Function.prototype.bind.apply(Date, [null].concat(dateString.split(','))))

Liam Gray Over a year ago

Thanks hindmost and abhishekkannojia 👍

magor Over a year ago

I am actually using Typescript + Angular2 and the compiler will compile to ES5...unfortunatelly both of the suggested options are failing. I know I could parse the string and pass to Date what it needs, I was just wondering if there is a simple solution like using split().

Liam Gray Over a year ago

How is it failing? The TypeScript compilation, or type checking? It appears to compile fine on typescriptlang.org/play

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