How to calculate the date three months prior using JavaScript ?

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.

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<!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>                    

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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.











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<!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>                     



















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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    


    • 



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