HTML5 includes a new data entry fields for “input elements”. One such of these is the type="date".
In browsers that do not support this type, a simple text box will be used. In those that do support it, the appearance will be dictated by the browser.
Try this is firefox, chrome, and opera (not safari).
<form action="http://www.example.com/bookings/" method="post">
<label for="departure-date">Departure date:</label>
<input type="date" name="depart" id="departure-date" />
<input type="submit" value="Submit" />
</form>