How to Integrate a Calendar Into Your Form
If you’re looking to include a calendar on your form, don’t get frustrated if the CSS for the calendar seems to be missing or broken. We purposefully did not include a calendar because it’s not a feature in XHTML/CSS, and we don’t want to include any scripts that might interfere with another developer’s website.
But don’t worry – you can still use a calendar feature on your site
If you wish to have a calendar on your site, we recommend this open-source calendar:
http://www.dynarch.com/projects/calendar/
It’s a JavaScript format, and if you go to the site, they include great documentation on the code and how to style the calendar for your own needs and integrate it with any type of form you’re developing.