Increment a given date in JavaScript

Given a date, the task is to increment it. To increment a date in javascript, we’re going to discuss few techniques. First few methods to know:

  • JavaScript getDate() method
    This method returns the day of the month (from 1 to 31) for the defined date.
    Syntax:

    Date.getDate()
    

    Return value:
    It returns a number, from 1 to 31, denoting the day of the month

  • JavaScript setDate() method
    This method sets the day of month to the date object.
    Syntax:

    Date.setDate(day)
    

    Parameters:

    • day:This parameter is required. It specifies the integer defining the day of a month. Values expected are 1-31 but less than 1 and greater than 31 values are used appropriately for previous and next month.

    Return value:
    It returns, representing the number of milliseconds between the date object and midnight January 1 1970.

  • JavaScript getTime() method
    This method returns the number of milliseconds between midnight of January 1, 1970 and the specified date.
    Syntax:



    Date.getTime()
    

    Return value:
    It returns a number, representing the number of milliseconds since midnight January 1, 1970.

  • JavaScript setTime() method
    This method set the date and time by adding/subtracting a defines number of milliseconds to/from midnight January 1, 1970.
    Syntax:

    Date.setTime(millisec)
    

    Parameters:

    • millisec:This parameter is required. It specifies the number of milliseconds to be added/subtracted, midnight January 1, 1970

    Return value:
    It returns, representing the number of milliseconds between the date object and midnight January 1 1970.

    • Example 1:This example increments 1 day to the 16th may by using setDate() and getDate() method.

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      <!DOCTYPE html>
      <html>
        
      <head>
          <title>
              JavaScript 
            | Incrementing a date.
          </title>
      </head>
        
      <body style="text-align:center;" id="body">
          <h1 style="color:green;">  
                  GeeksForGeeks  
              </h1>
          <p id="GFG_UP"
             style="font-size: 15px;
                    font-weight: bold;">
          </p>
          <button onclick="gfg_Run()">
              Increment by 1 day
          </button>
          <p id="GFG_DOWN" 
             style="color:green; 
                    font-size: 20px; 
                    font-weight: bold;">
          </p>
          <script>
              var el_up = document.getElementById("GFG_UP");
              var el_down = document.getElementById("GFG_DOWN");
              var today = new Date();
              el_up.innerHTML = "Today's date = " + today;
        
              function gfg_Run() {
                  var tomorrow = new Date();
                  tomorrow.setDate(today.getDate() + 1);
                  el_down.innerHTML = tomorrow;
              }
          </script>
      </body>
        
      </html>

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      Output:

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

      Example 2:This example increments 10 day to the 16th may by using setTime() and getTime() method.

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      <!DOCTYPE html>
      <html>
        
      <head>
          <title>
              JavaScript | Incrementing a date.
          </title>
      </head>
        
      <body style="text-align:center;"
            id="body">
          <h1 style="color:green;">  
                  GeeksForGeeks  
              </h1>
          <p id="GFG_UP" 
             style="font-size: 15px; 
                    font-weight: bold;">
          </p>
          <button onclick="gfg_Run()">
              Increment by days
          </button>
          <p id="GFG_DOWN"
             style="color:green; 
                    font-size: 20px; 
                    font-weight: bold;">
          </p>
          <script>
              var el_up = document.getElementById("GFG_UP");
              var el_down = document.getElementById("GFG_DOWN");
              var today = new Date();
              var days = 10;
              el_up.innerHTML = "Today's date = " + today;
        
              function gfg_Run() {
                  var tomorrow = new Date();
                  tomorrow.setTime(today.getTime() + days * 86400000);
                  el_down.innerHTML = tomorrow;
              }
          </script>
      </body>
        
      </html>

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      Output:

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


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