Parsing a string to a date in JavaScript

JavaScript provides several ways to parse a string into a Date object. In this article, we will explore different methods to achieve this.

Using the built-in Date constructor

The most common approach is to use the built-in Date constructor in JavaScript. Here is how you can convert a string to a Date object:

var st = "2022-02-10";
var dt = new Date(st);
console.log(dt); // Output: Thu Feb 10 2022 00:00:00 GMT+0000 (Coordinated Universal Time)

In the example above, we pass the string "2022-02-10" to the Date constructor, which creates a new Date object representing the given date. The output shows the Date object in the default string format.

Using the moment.js library

If you need more flexibility and advanced parsing capabilities, you can consider using the moment.js library. Moment.js provides a simple and powerful API to handle date and time in JavaScript.

First, you need to include the moment.js library in your project. You can download it from the official website or include it from a CDN. Once you have the library included, you can use the moment() function to parse a string into a moment object:

var st = "February 10, 2022";
var dt = moment(st);
console.log(dt.format()); // Output: 2022-02-10T00:00:00Z

In the code snippet above, we first create a moment object by passing the string "February 10, 2022" to the moment() function. We can then format the moment object using the format() function to get the desired output.

Using regular expressions

If you have a specific date format that is not supported by the built-in Date constructor or moment.js library, you can use regular expressions to extract the date components and create a Date object manually.

Here is an example of parsing a date in the format "YYYY-MM-DD" using regular expressions:

var st = "2022-02-10";
var dateParts = st.match(/(\d{4})-(\d{2})-(\d{2})/);
var dt = new Date(dateParts[1], parseInt(dateParts[2]) - 1, dateParts[3]);
console.log(dt); // Output: Thu Feb 10 2022 00:00:00 GMT+0000 (Coordinated Universal Time)

In the code snippet above, we use the match() function with a regular expression to extract the year, month, and day components from the string. We then construct a new Date object using these components and the appropriate Date constructor arguments.

Handling different date formats

In real-world scenarios, you may encounter various date formats in your strings. To handle different date formats, you can combine the above approaches with conditional statements or use additional libraries like moment.js with custom format parsing.

Here is an example of parsing dates in different formats using the moment.js library:

var st1 = "02/10/2022";
var st2 = "February 10, 2022";
var dt1 = moment(st1, ["MM/DD/YYYY", "DD/MM/YYYY"]);
var dt2 = moment(st2, ["MMMM D, YYYY", "D MMMM, YYYY"]);
console.log(dt1.format()); // Output: 2022-02-10T00:00:00Z
console.log(dt2.format()); // Output: 2022-02-10T00:00:00Z

In the code snippet above, we provide an array of possible date formats to the moment() function. The library will try each format until it successfully parses the date or returns an invalid date.


Parsing a string to a Date object in JavaScript can be done using the built-in Date constructor, the moment.js library, or regular expressions. The choice of method depends on your specific requirements and the date formats you need to handle. Remember to consider the limitations and edge cases when parsing dates, and always validate the output to ensure accurate results.

Happy coding!