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JavaScript | Adding seconds to Date object

  • Last Updated : 23 May, 2019

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

  • JavaScript getSeconds() Method
    This method returns the Seconds(from 0 to 59) of the provided date and time.
    Syntax:

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    Date.getSeconds()
    

    Return value:
    It returns a number, from 0 to 59, representing the seconds.

  • JavaScript setSeconds() Method
    This method set the seconds of a date object.
    This method can also be used to set the milliseconds.
    Syntax:

    Date.setSeconds(sec, millisec)
    

    Parameters:



    • sec: This parameter is optional. It specifies the integer representing the seconds. Values expected are 0-59, but other values are allowed.
    • millisec: This parameter is optional. It specifies the integer representing the milliseconds. Values expected are 0-999, but other values are allowed.

    Note:
    All the previous 2 parameters accept values apart from their range and these values adjust like.

    • sec = -1, means the last second of the previous minute and same for the other parameters.
    • if sec passed is 60, means the first second of the next minute and same for the other parameters.

    Return value:
    It returns a number, denoting 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 defined 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 adds 100 seconds to the var today by using setTime() and getTime() method.




      <!DOCTYPE HTML>
      <html>
        
      <head>
          <title>
              JavaScript 
            | Adding Seconds to Date object.
          </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()">
              addSeconds
          </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 = "Date = " + today;
              Date.prototype.addSecs = function(s) {
                  this.setTime(this.getTime() + (s * 1000));
                  return this;
              }
        
              function gfg_Run() {
                  var a = new Date();
                  a.addSecs(100);
                  el_down.innerHTML = a;
              }
          </script>
      </body>
        
      </html>

      Output:

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

      Example 2: This example adds 10 seconds to the var today by using setSeconds() and getSeconds() method.




      <!DOCTYPE HTML>
      <html>
        
      <head>
          <title>
              JavaScript 
            | Adding Seconds to Date object.
          </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()">
              addSeconds
          </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 = "Date = " + today;
              Date.prototype.addSecs = function(s) {
                  this.setSeconds(this.getSeconds() + s);
                  return this;
              }
        
              function gfg_Run() {
                  var a = new Date();
                  a.addSecs(10);
                  el_down.innerHTML = a;
              }
          </script>
      </body>
        
      </html>

      Output:

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



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