How to calculate the date three months prior using JavaScript ?

Difficulty Level : Easy
Last Updated : 19 Jun, 2019

Given a Date and the task is to get the date of three month 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 return the date.

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

<!DOCTYPE HTML>  
<html>  
    <head>  
        <title>  
            How to calculate the date 
            three months prior to today 
        </title> 
    </head>  
      
    <body style = "text-align:center;">  
          
        <h1 style = "color:green;" >  
            GeeksForGeeks  
        </h1> 
          
        <p id = "GFG_UP" style = 
            "font-size: 19px; font-weight: bold;"> 
        </p> 
          
        <button onClick = "GFG_Fun()"> 
            click here 
        </button> 
          
        <p id = "GFG_DOWN" style = 
            "color: green; font-size: 24px; font-weight: bold;"> 
        </p> 
          
        <script> 
            var up = document.getElementById('GFG_UP'); 
            var down = document.getElementById('GFG_DOWN'); 
            var d = new Date(); 
              
            up.innerHTML = "Today's Date= "+ d.toLocaleDateString(); 
              
            function GFG_Fun() { 
                d.setMonth(d.getMonth() - 3); 
                down.innerHTML = "Before 3 Months, Date is " 
                        + d.toLocaleDateString(); 
            } 
        </script>  
    </body>  
</html>                     

Output:

Before clicking on the button:
After clicking on the button:

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

<!DOCTYPE HTML>  
<html>  
    <head>  
        <title>  
            How to calculate the date 
            three months prior to today 
        </title> 
    </head>  
      
    <body style = "text-align:center;">  
          
        <h1 style = "color:green;" >  
            GeeksForGeeks  
        </h1> 
          
        <p id = "GFG_UP" style = 
            "font-size: 19px; font-weight: bold;"> 
        </p> 
          
        <button onClick = "GFG_Fun()"> 
            click here 
        </button> 
          
        <p id = "GFG_DOWN" style = 
            "color: green; font-size: 24px; font-weight: bold;"> 
        </p> 
          
        <script> 
            var up = document.getElementById('GFG_UP'); 
            var down = document.getElementById('GFG_DOWN'); 
            var d = new Date("2010/12/02"); 
              
            up.innerHTML = "Date= "+ d.toLocaleDateString(); 
              
            function GFG_Fun() { 
                d.setMonth(d.getMonth() - 3); 
                down.innerHTML = "Before 3 Months, Date is " 
                        + d.toLocaleDateString(); 
            } 
        </script>  
    </body>  
</html>                     

Output:

Before clicking on the button:
After clicking on the button:

My Personal Notes

Related Articles