SO fiddle

Test Fiddle mainly for SO Questions

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<input type="text" id="datepicker" />

JavaScript

$("#datepicker").datepicker({
    minDate: '-1w',
    maxDate: '+1w'
});
    
$(".ui-datepicker-unselectable").live('click', function() {
  alert("Invalid date!");
});