New on PHPBuilder.com there's a quick tutorial showing you how to create a simple calendar and add dates for your events.

Gone were any thoughts of simplicity whatsoever, or so I thought. Then it struck me. What was a calender but just a looping number system? The more I thought about it the more simple it became. At the end of the day, with a little research into PHP's date functions I had come up with something that actually worked. The working example can be downloaded here.

Their example uses either the current month or one inputted from the URL to determine things like day of the week to start, number of days in the month, how many weeks to display, etc. They also have to take the year into consideration so switching between December and January is just as seamless.