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How to convert JSON results into a date using JavaScript?
JSON is a powerful data format to exchange data from server to client and vice versa. Many times JSON data is received in a String format and we need to convert it to a usable JSON object. In this process, it's an important requirement to convert string data into Date format. In this article, we will learn how to convert JSON results into a Date string using JavaScript.
The JSON objects contain the date like this ?
{
name: "John",
time: '/Date(1559072200000)/'
}
And the result will be ?
Wed May 29 2019 01:06:40 GMT+0530 (India Standard Time)
Here are a few approaches to achieve this ?
Using string.replace method
Using Regex
Approach 1: Using String replace() Method
The replace method in JavaScript is used to replace a portion of a string with another string. Here are the steps to convert JSON results into a date using the String.replace method:
Replace the first part of the string "/Date(" with an empty string
Replace the last part of the string ")/" with an empty string
Create a new Date object by parsing the number of milliseconds from the JSON string
Now you got the Date and you can use it as a normal JavaScript date.
Example
In this example we are converting JSON results into a date using the String.replace() method.
<html>
<body>
<h2>Convert JSON results into a date using JavaScript</h2>
<p>Click the following button to convert JSON results into a date</p>
<button id="btn" onclick="convert()"> Click Here </button> <br>
<h3>Input Data : </h3>
<p id="input"> /Date(1559072200000)/ </p>
<h3> Resulting Date: </h3>
<p id="output"> </p>
<script>
function convert() {
// Store the JSON date string in a variable
var jsonDate = '/Date(1559072200000)/';
// Replace the first part of the string "/Date(" with an empty string
jsonDate = jsonDate.replace("/Date(", "");
// Replace the last part of the string ")/" with an empty string
jsonDate = jsonDate.replace(")/", "");
// Create a new Date object by parsing the number of milliseconds from the JSON string
let strDate = new Date(parseInt(jsonDate));
// Get the output element in the HTML document
let output = document.getElementById("output");
// Set the inner text of the output element to the formatted date
output.innerText = strDate;
}
</script>
</body>
</html>
Wed May 29 2019 01:06:40 GMT+0530 (India Standard Time)
Approach 2: Using Regex
Here are the following steps to convert JSON results into a date using regex:
Extract the unix timestamp from the JSON date string using regex
Create a new Date object by parsing the number of milliseconds from the JSON string
Now you got the Date and you can use it as a normal JavaScript date.
Example
<html>
<body>
<h2>Convert JSON results into a date using JavaScript</h2>
<p>Click the following button to convert JSON results into a date</p>
<button id="btn" onclick="convert()"> Click Here </button> <br>
<h3>Input Data : </h3>
<p id="input"> /Date(1559072200000)/ </p>
<h3> Resulting Date: </h3>
<p id="output"> </p>
<script>
// Function to convert the JSON date format to a readable date
function convert() {
// The JSON date string in the format '/Date(unixTimestamp)/'
var jsonDate = '/Date(1559072200000)/';
// Extract the Unix timestamp from the JSON date string using regex
var timestamp = jsonDate.match(/\d+/);
// Create a new Date object using the unix timestamp
let strDate = new Date(parseInt(timestamp[0]));
// Get a reference to the HTML element with the id "output"
let output = document.getElementById("output");
output.innerText = strDate;
}
</script>
</body>
</html>
Wed May 29 2019 01:06:40 GMT+0530 (India Standard Time)
Comparison
| Method | Code Complexity | Performance | Readability |
|---|---|---|---|
| String.replace() | Medium (two replace calls) | Good | High |
| Regex | Low (one match call) | Better | Medium |
Conclusion
Both methods effectively convert JSON date strings to JavaScript Date objects. The regex approach is more concise and performs better, while the String.replace() method is more readable for beginners. Choose based on your team's familiarity with regex patterns.
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