gistfile1.java

myButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        SimpleDateFormat formatter = new SimpleDateFormat("h:mm:ss a");
        String strWhen = formatter.format(new Date());               
        TextView myTextview = (TextView) 
            findViewById(R.id.TextViewToShow);
        myTextview.setText("Clicked at " +  strWhen);
    }
});