Convert from dateTime string to javascript date object

Question

I use this method in order to convert a date string to a javascript date object:

function convertToDateOrUndefined(dateString) {
    if (dateString instanceof Date || dateString == null) { 
        return undefined;
    }
    return new Date(dateString.replace(/(\d{2})\.(\d{2})\.(\d{4})/,'$3-$2-$1'));
}

Currently I have this dateTime string 'dd.MM.yyyy HH:mm' and I would need also a function to convert this string into a js date obejct. I am not really good in regex therefore I would need help - Thanks!

GilZ · Accepted Answer · 2016-12-25 16:52:11Z

1

Look at the current regex. You know it returns a date from your dd.MM.yyyy format, right? So you can assume that the three (\d{n}) represent the day, month and year (\d means a digit, {n} means n times, so \d{2} mean two digits; the () groups each part so we can refer to them later).

In the second string, we take the parts the we got from the 1st one, and reorder them. $1 is the 1st group (the part of the regex inside the ()), $2 is the 2nd group, etc.

From there, the way to the solution is simple. We just need to add the time part:

new Date(dateString.replace(/(\d{2})\.(\d{2})\.(\d{4}) (\d{2}):(\d{2})/,'$3-$2-$1 $4:$5'));

edited Dec 25, 2016 at 16:52

answered Dec 25, 2016 at 16:46

GilZ

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Jyothi Babu Araja · Accepted Answer · 2016-12-25 16:45:24Z

0

A non regex solution. Hope this helps

var dateString = '25.12.2016 00:00';
var formattedDateString  = dateString.split(' ')[0].split('.').reverse().join('-');

var dateObj = new Date(formattedDateString);

console.log(dateObj);

answered Dec 25, 2016 at 16:45

Jyothi Babu Araja

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