Javascript: convert date string to date object correctly

Question

I have string date for example '20200321082245'. I am trying to convert it by pure Javaccript code to a date object by spliting it and creating an date object for example:

'20200321082245' --> 2020-03-21 08:22:45

'202003210.2245' --> This case with a dot must be excluded. I must return a null date object

How can I convert it correctly ? Since the syncDate could contain a dot also for example a double number also not integer.

My Code:

        function convertDate(syncDate){
            var date = null;
            if(syncDate){
            try {
                if (!isNaN(syncDate)) {
                        var d = syncDate.toString().match(/.{1,2}/g)
                        var len = d.length;
                        var dateString = '';
                        switch(len){
                            case 2:
                                dateString = d[0]+d[1];
                            case 3:
                                dateString = d[0]+d[1] +'-'+d[2]
                            case 4:
                                dateString = d[0]+d[1] +'-'+d[2]+'-'+d[3]
                            case 5:
                                dateString = d[0]+d[1] +'-'+d[2]+'-'+ d[3]+' '+d[4]
                            case 6:
                                dateString = d[0]+d[1] +'-'+d[2]+'-'+d[3]+' '+d[4]+':'+d[5];
                            case 7:
                                dateString = d[0]+d[1] +'-'+d[2]+'-'+d[3]+' '+d[4]+':'+d[5]+':'+d[6];
                        }
                      if(dateString)
                         date = new Date(dateString);
                    }
                } catch (e) {}
            }

            return date;
         }

You're already using a regular expression. Use one that matches all of the date parts, convert the parts to actual numbers and construct the date with them. — Andreas
– Andreas, Commented Apr 22, 2020 at 14:40
@Andreas: something like /^\d+$/.test(syncDate). Sorry but I am not well familiar with regex. — benz
– benz, Commented Apr 22, 2020 at 14:51

Artem Bozhko · Accepted Answer · 2020-04-22 15:32:43Z

2

var value = '20200321082245';
var dateRx = /(^\d\d\d\d)(\d\d)(\d\d)(\d\d)?(\d\d)?(\d\d)?/;
if (dateRx.test(value)) {
    return new Date(value.replace(dateRx, '$1-$2-$3 $4:$5:$6'));
}
return null;

edited Apr 22, 2020 at 15:32

answered Apr 22, 2020 at 14:58

Artem Bozhko

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5 Comments

benz Over a year ago

Thank you for your answer, What about this one '20200321082'.replace(/(^\d\d\d\d)(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)/, '$1-$2-$3 $4:$5:$6') -->I am getting as result the following '20200321082'

benz Over a year ago

I am not getting a result for var value = '2020032108'; since new Date('2020-03-21 08:') is an date object

benz Over a year ago

Therefore I am building the string in the switch part

Artem Bozhko Over a year ago

You did not provide such an example in your question. Write your question more clearly and you'll get a right answer

Artem Bozhko Over a year ago

Anyway, you can achieve what you want by making last three groups optional. Answer edited.

gian.gyger · Accepted Answer · 2020-04-22 14:49:44Z

0

You can check if the string contains a . by using the includes property.

if(string.includes('.')){
    return null;
}

About converting it into a date object, there are several ways to achieve this. See here

answered Apr 22, 2020 at 14:49

gian.gyger

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