Features:

Live preview of all settings
Customizable year
Adjustable months per row
Control over vertical and horizontal month spacing
Control over date row spacing
Custom font selection
Separate font size controls for month titles, day headers, and dates
Optional week number display

How to Use?

Place the .jsx file in your Illustrator Scripts folder.
Go to File > Scripts and run "Calendar Perfect Creator".
Adjust the settings in the dialog and click "Create". It's that simple!