How can I convert a 8 digit number to date format

Question

I have a 5 digit number stored in a variable. The next step is to convert the number to a date. for example

var x = 20151506;

The above number has to be converted to:

Thu June 15 2015 06:35:50

The [`Date` constructor](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date) supports multiple parameters. Just split up your value into pieces and pass each piece in (`new Date(year, month, day)`). — gen_Eric, May 31 '16 at 15:36
That's impossible, unless the time part is calculated otherwise. — Reinstate Monica Cellio, May 31 '16 at 15:36
The number looks like just the date part in yyyyddmm format. no time info — phuzi, May 31 '16 at 15:36
when i try something like this: new Date(20152605) Thu Jan 01 1970 06:35:52 GMT+0100 (W. Europe Standard Time). It give me a wrong value. — Rickey, May 31 '16 at 15:40
@AjayKumarHolla: That's because it's expecting your value to be a timestamp. — gen_Eric, May 31 '16 at 15:41
@RocketHazmat so what can be the best solution can u put up. — Rickey, May 31 '16 at 15:42
So regular expression, match the parts, turn it into a date... Not sure houw you get a time from that data... — epascarello, May 31 '16 at 15:42

score 2 · Answer 1 · edited May 23 '17 at 12:15

Please note that you must first specify the time in your original date value for it to be formatted and included correctly in your output. Thus the following will not provide the time element as you're looking for.

Referencing this SO answer:

function parse(str) {
    var y = str.substr(0,4),
        m = str.substr(6,2) - 1,
        d = str.substr(4,2);
    var D = new Date(y,m,d);
    return (D.getFullYear() == y && D.getMonth() == m && D.getDate() == d) ? D : 'invalid date';
}

Usage:

parse('20151506');

Output:

Mon Jun 15 2015 00:00:00 GMT-0500 (Central Daylight Time)

or in your case

parse(x.toString());

Output:

Mon Jun 15 2015 00:00:00 GMT-0500 (Central Daylight Time)

Code snippet provided below:

var x = 20151506;

function parse(str) {
    var y = str.substr(0,4),
        m = str.substr(6,2) - 1,
        d = str.substr(4,2);
    var D = new Date(y,m,d);
    return (D.getFullYear() == y && D.getMonth() == m && D.getDate() == d) ? D : 'invalid date';
}

 //document.write (parse('20151506')); 
 document.write (parse(x.toString()));

@HappyCoding: It dosent work in this case. Try in console and let me know. — Rickey, May 31 '16 at 15:44

phuzi · Answer 2 · 2016-05-31T15:59:24.473

To convert that "number" in to a Date you'll have to split it into the relevant year month day (hours, minutes and seconds appear to be missing).

var x = 20151506;
var month = x % 100;
var day = Math.floor(x % 10000 / 100);
var year = Math.floor(x / 10000);
var date = new Date(year, month - 1, day)

This will give you the value of date in whateve your local timezone is - Mon Jun 15 2015 00:00:00 GMT+0100 (GMT Daylight Time).

Not sure where you get the your time part from?

How can I convert a 8 digit number to date format

2 Answers2