Bottone Mostra orario

 
           <!DOCTYPE html>  
 
           <html>  
 
           <body>  
 
           <p>Click the button to display the time.</p>  
 
           <button onclick="getElementById('demo').innerHTML=Date()">What is the time?</button>  
 
           <p id="demo"></p>  
 
           </body>  
 
           </html>