How To Minus 30 Days From Current Date In Javascript

In the world of JavaScript programming, manipulating dates is a common task. One such scenario is subtracting a specific number of days from the current date. In this article, we will explore various methods to achieve this functionality in JavaScript. We will focus on clarity and simplicity, providing easy-to-follow methods and code breakdowns.

Method 1: Using Vanilla JavaScript

To minus 30 days from the current date in JavaScript using vanilla JS, follow these steps:

1. Get the Current Date: First, we need to obtain the current date using the Date object in JavaScript.
2. Subtract 30 Days: To subtract 30 days, we can utilize simple arithmetic by subtracting the number of milliseconds in 30 days from the current date.
3. Format the Result: Finally, format the resulting date in the desired format using methods like getDate(), getMonth(), and getFullYear().

Here is a sample code snippet:

const currentDate = new Date();
const minus30Days = new Date(currentDate.getTime() - 30 * 24 * 60 * 60 * 1000);

const day = minus30Days.getDate();
const month = minus30Days.getMonth() + 1; // Months are zero-based
const year = minus30Days.getFullYear();

const formattedDate = `${year}-${month < 10 ? '0' : ''}${month}-${day < 10 ? '0' : ''}${day}`;

Method 2: Using External Libraries like Moment.js

Another approach is to leverage external libraries like Moment.js for date manipulation. Here’s how you can achieve the same functionality with Moment.js:

1. Install Moment.js: Start by including Moment.js in your project either via npm or by linking the library in your HTML file.
2. Subtract 30 Days: Use Moment.js functions like subtract() to subtract 30 days from the current date.
3. Format the Result: Similar to Method 1, format the resulting date according to your requirements.

Below is a sample code snippet using Moment.js:

const currentDate = moment();
const minus30Days = currentDate.subtract(30, 'days');

const formattedDate = minus30Days.format('YYYY-MM-DD');

Method 3: Using Date Objects and Set Methods

An additional method involves utilizing JavaScript’s setDate() and setMonth() methods to subtract 30 days from the current date:

1. Get the Current Date: Obtain the current date using the Date object as in Method 1.
2. Subtract 30 Days: Set the date back by 30 days using setDate() and setMonth().
3. Format the Result: Format the updated date as needed.

Here is a code snippet illustrating this method:

const currentDate = new Date();
currentDate.setDate(currentDate.getDate() - 30);

const day = currentDate.getDate();
const month = currentDate.getMonth() + 1; // Months are zero-based
const year = currentDate.getFullYear();

const formattedDate = `${year}-${month < 10 ? '0' : ''}${month}-${day < 10 ? '0' : ''}${day}`;

Conclusion

By incorporating these diverse methods, you have multiple options to minus 30 days from the current date in JavaScript. Whether you prefer vanilla JavaScript, external libraries like Moment.js, or direct manipulation using setDate() and setMonth(), date calculations can be tailored to suit your specific requirements. Experiment with these approaches and choose the one that best fits your coding style and project needs. Happy coding!