open_in_new content_copy 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>Chai aur Javascript</h1>
    <button id="start">Start</button>
    <button id="stop">Stop</button>
</body>
<script>
    const sayDate = function(str){
        console.log(str, Date.now()); 
    }

    const intervalId = setInterval(sayDate, 1000, "hi") // it wil print date after 1 sec 

    clearInterval(intervalId) // for stopping the setInterval 
</script>
</html>