How to Round off Time to Nearest 5 Min using JavaScript ?

Last Updated : 29 Jan, 2020

Given a JavaScript date and the task is to round it to 5 minutes with the help of JavaScript. There are two approaches that are discussed below:

Approach 1: In this approach, both options are available to either round down or round up the date object. This example uses basic Math.floor() function and Math.ceil() function to perform the operation.

Example: This example implements the above approach.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Round off a Date Object to 5 
        minutes in JavaScript. 
    </title> 
</head> 
  
<body style="text-align:center;"> 
      
    <h1 style="color:green;"> 
        GeeksforGeeks 
    </h1> 
      
    <p id="gfg" style="font-size: 20px;  
                    font-weight: bold"> 
    </p> 
      
    <button onclick="GFG_Fun1();"> 
        Round Down 
    </button> 
      
    <button onclick="GFG_Fun2();"> 
        Round Up 
    </button> 
      
    <p id="geeks" style="font-size: 26px;  
            font-weight: bold;color: green;"> 
    </p> 
      
    <script> 
        var up = document.getElementById('gfg'); 
        var down = document.getElementById('geeks'); 
        var date = new Date(); 
        up.innerHTML = "Click on the button to " 
                + "round the date as specified." 
                + "<br><br>Date - " + date; 
  
        function GFG_Fun1() { 
              
            // ms in 5 minutes. 
            var coff = 1000 * 60 * 5;  
              
            down.innerHTML = new Date( 
                    Math.floor(date / coff) * coff); 
        } 
  
        function GFG_Fun2() { 
              
            // ms in 5 minutes. 
            var coff = 1000 * 60 * 5;  
            down.innerHTML = new Date( 
                    Math.ceil(date / coff) * coff); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Approach 2: This example uses basic Math.round() function to perform the operation. Calculate the milliseconds in 5 minutes, divide the date object by milliseconds and get the round value then again multiply the milliseconds.

Example: This example implements the above approach.

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Round off a Date Object to 5 
        minutes in JavaScript. 
    </title> 
</head> 
  
<body style="text-align:center;"> 
      
    <h1 style="color:green;"> 
        GeeksforGeeks 
    </h1> 
      
    <p id="GFG_UP" style = 
        "font-size: 20px;font-weight: bold">  
    </p> 
      
    <button onclick = "GFG_Fun();">  
        click here  
    </button>  
      
    <p id="GFG_DOWN" style = "font-size: 26px;  
            font-weight: bold;color: green;">  
    </p> 
      
    <script>  
        var up = document.getElementById('GFG_UP'); 
        var down = document.getElementById('GFG_DOWN'); 
        var date = new Date(); 
        up.innerHTML = "Click on the button to " 
                + "round the date as specified." 
                + "<br><br>Date - " + date; 
          
        function GFG_Fun() { 
              
            // ms in 5 minutes. 
            var coff = 1000 * 60 * 5;  
            down.innerHTML = new Date(Math.round( 
                    date.getTime() / coff) * coff); 
        }  
    </script>  
</body> 
  
</html>                            