How do you display JavaScript datetime in 12 hour AM/PM format?

Last Updated : 28 Jun, 2019

JavaScript uses the 24-hour format as default for DateTime. However, daytime in JavaScript can be displayed in 12 hour AM/PM format using several approaches. We will look into a couple in this article.

Approach 1:
In this approach, we will change the DateTime format by only using native methods. Simply put, we will apply modulo “%” operator to find the hour in 12-hour format and use conditional “?:” operator to apply “AM” or “PM”.

Program:

<!DOCTYPE html> 
<html> 
  
<body> 
    <center> 
        <h1 style="color:green"> 
          GeeksforGeeks 
      </h1> 
        <p> 
          Click the button to change the  
          format using Native method. 
      </p> 
        <div id="old_time"></div> 
        <script> 
            // JavaScript Program to display 
            // current time in 24-hour format 
            var date = new Date(); 
            var hours = (date.getHours() < 10 ? '0' : '') +  
                date.getHours(); 
            var minutes = (date.getMinutes() < 10 ? '0' : '') +  
                date.getMinutes(); 
            
            var div = document.getElementById('old_time'); 
            div.innerHTML = hours + ":" + minutes; 
        </script> 
  
        <button onclick="myFunction()"> 
          Change 
      </button> 
        
        <p id="change"></p> 
        <script> 
            // JavaScript function to 
            // Display 12 hour format 
            function myFunction() { 
                var date = new Date(); 
                var hours = date.getHours(); 
                var minutes = date.getMinutes(); 
                
                // Check whether AM or PM 
                var newformat = hours >= 12 ? 'PM' : 'AM';  
                
                // Find current hour in AM-PM Format 
                hours = hours % 12;  
                
                // To display "0" as "12" 
                hours = hours ? hours : 12;  
                minutes = minutes < 10 ? '0' + minutes : minutes; 
                
                document.getElementById("change").innerHTML =  
                  hours + ':' + minutes + ' ' + newformat; 
            } 
        </script> 
  </center> 
</body> 
  
</html> 

Before:
before

After:
after

Approach 2:
In this approach, we will utilize an inbuilt method toLocaleString() to change the format of given date into AM-PM format.

toLocaleString(): It returns a string representation of the date Object. The 2 arguments Locale and options allow for customization of the behavior of the method.

Syntax:

dateObject.toLocaleString([locales[, options]])

Program:

<!DOCTYPE html> 
<html> 
  
<body> 
    <center> 
        <h1 style="color:green">GeeksforGeeks</h1> 
        <p>Click the button to change the format.</p> 
        <div id="old_time"></div> 
        <script> 
            var date = new Date(); 
            var hours = (date.getHours() < 10 ? '0' : '') + 
                date.getHours(); 
            var minutes = (date.getMinutes() < 10 ? '0' : '') +  
                date.getMinutes(); 
            var div = document.getElementById('old_time'); 
            div.innerHTML = hours + ":" + minutes; 
        </script> 
  
        <button onclick="myFunction()"> 
          Change 
      </button> 
        
        <p id="change"></p> 
        <script> 
            var now = new Date(); 
            var hours = now.getHours(); 
  
            function myFunction() { 
                var d = new Date(); 
                var n = d.toLocaleString([], { 
                    hour: '2-digit', 
                    minute: '2-digit'
                }); 
                document.getElementById("change").innerHTML = n; 
            } 
        </script> 
  </center> 
</body> 
  
</html> 

Before:
Before change

After:
After change

My Personal Notes

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