PHP Calendar library

I have to modify a simple hotel booking system to be able to show a calendar 开发者_开发问答of a given week or daterange.

I need to have it so that for each day I can show room availability and color code it as neccessary.

I would also need to make it so that rates would automatically be adjusted/calulated for weekends.

Is there a library or inbuilt functionality that allows for displaying several days each with additional fields and is able to identify days as weekends?

The jQuery UI Datepicker plugin can probably get you most of the way there, but you will have to do some AJAX requests to your PHP scripts to determine what date ranges are valid (assuming you have this stuff in a database).