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

Question

How do you display a JavaScript datetime object in the 12 hour format (AM/PM)?

Answer 1

function formatTime( d = new Date(), ampm = true ) 
{
    var hour = d.getHours();
    
    if ( ampm )
    {
        var a = ( hour >= 12 ) ? 'PM' : 'AM';
        hour = hour % 12;
        hour = hour ? hour : 12; // the hour '0' should be '12'  
    }

    var hour    = checkDigit(hour);  
    var minute  = checkDigit(d.getMinutes());
    var second  = checkDigit(d.getSeconds());
  
    // https://stackoverflow.com/questions/1408289/how-can-i-do-string-interpolation-in-javascript
    return ( ampm ) ? `${hour}:${minute}:${second} ${a}` : `${hour}:${minute}:${second}`;
}

function checkDigit(t)
{
  return ( t < 10 ) ? `0${t}` : t;
}

document.querySelector("#time1").innerHTML = formatTime();
document.querySelector("#time2").innerHTML = formatTime( new Date(), false );

ampm true:    (default)
ampm false: