How to calculate the date three months prior using JavaScript ?

To calculate the date three months prior using JavaScript, we could use the getMonth() and setMonth() methods. In this article, we are going to learn how to calculate the date three months prior using JavaScript.

Approach

• First, select the date object.
• Then use the getMonth() method to get the months.
• Then subtract three months from the getMonth() method and set it using setMonth() method.

Example 1: This example uses getMonth() and setMonth() methods to get and set the month date. 

Javascript

let d = new Date();

console.log("Today's Date: "
    + d.toLocaleDateString());

d.setMonth(d.getMonth() - 3);

console.log("3 months Prior Date: "
        + d.toLocaleDateString());

Output

Today's Date: 12/27/2023
3 months Prior Date: 9/27/2023

Example 2: This example uses getMonth() and setMonth() methods to get and set the month date as provided. 

Javascript

let d = new Date("2018/12/02");

console.log("Date: " + d.toLocaleDateString());

d.setMonth(d.getMonth() - 3);
console.log("3 Months Prior Date: "
        + d.toLocaleDateString());

Output

Date: 12/2/2018
3 Months Prior Date: 9/2/2018