Converting a time string into a date object using JavaScript and AngularJS

After receiving the string from the REST API as "20160220", I am aiming to format it as "20/02/2016".

Utilizing AngularJS for this task, I understand that I will need to implement a filter. I have already attempted the code snippet below:

app.filter('myDateFilter', function() {

  return function(input) {

  var st = input;  
  var pattern = /(\d{4})(\d{2})(\d{2})/;
  var date = new Date(st.replace(pattern, '$1-$2-$3'));

  return date;

  }

});

Furthermore, in my HTML code, I have included the following:

                <td>
                    {{t["due-date"] | myDateFilter}}
                </td>

However, the output I receive is "2016-02-20T00:00:00.000Z". Could this be an issue with the regular expression? I would greatly appreciate it if you could provide me with the correct code snippet that could be used instead to generate "20/02/2016".

Answer №1

When you simply convert a Date into a string, the output appears as follows:

console.log(new Date()) // "2016-09-02T15:19:07.921Z"

For a more accurate representation, manually format the date into a string before returning it. For example, using toLocaleDateString() will convert the Date into a string that considers the browser's locale:

console.log(new Date().toLocaleDateString()) // "09/02/2016"

Answer №2

You are currently transforming a `String` into a `Date()` object, which is the correct approach. When you display your `Date()` object in your view, it will appear in the default date format.

If you want to customize the way your `Date()` object is displayed, you must add another filter to your custom filter. In this situation, you should incorporate the `date` filter: https://docs.angularjs.org/api/ng/filter/date

To implement this, simply include it in your template, as shown below:

<td>
    {{t["due-date"] | myDateFilter | date : 'dd/MM/yyyy'}}
</td>

By doing this, the `date` filter will utilize the `Date()` object generated by your custom `myDateFilter` filter and produce a resulting `String` representation of that object.

This serves as a great illustration of how angular filters and filter chaining should be utilized.

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