How to convert JSON results into a date using JavaScript ?

The task is to convert a JSON result to JavaScript Date with the help of JavaScript. There are two methods which are discussed below: 

Approach 1:

• Use substr() method to get the integer part of the string.
• Use the parseInt() method followed by Date() to get the JavaScript date.

Example: This example implements the above approach. 

html

<h1 style="color:green;">
    GeeksforGeeks
</h1>

<p id="GFG_UP">
</p>

<button onclick="gfg_Run()">
    click here
</button>

<p id="GFG_DOWN">
</p>

<script>
    var el_up = document.getElementById("GFG_UP");
    var el_down = document.getElementById("GFG_DOWN");
    var jsonDate = '/Date(1559083200000)/';

    el_up.innerHTML = "Click on the button to convert"
                + " JSON result to JavaScript Date."
                + "<br>JSON Date - " + jsonDate;

    function gfg_Run() {
        var date = new Date(parseInt(jsonDate.substr(6)));
        el_down.innerHTML = date;
    }
</script>

Output:

How to convert JSON results into a date using JavaScript ?

Approach 2:

• Use the regExp to get the integer part of the string.
• Use the Date() method to get the JavaScript date.

Example: This example implements the above approach. 

html

<h1 style="color:green;">
    GeeksforGeeks
</h1>

<p id="GFG_UP">
</p>

<button onclick="gfg_Run()">
    click here
</button>

<p id="GFG_DOWN">
</p>

<script>
    var el_up = document.getElementById("GFG_UP");
    var el_down = document.getElementById("GFG_DOWN");
    var jsonDate = '/Date(1559083200000)/';

    el_up.innerHTML = "Click on the button to convert"
                + " JSON result to JavaScript Date."
                + "<br>JSON Date - " + jsonDate;

    function gfg_Run() {
        var date = new Date(jsonDate.match(/\d+/)[0] * 1);
        el_down.innerHTML = date;
    }
</script>

Output:

How to convert JSON results into a date using JavaScript ?