How can I use Calendar in my iPhone Application?

I have an application of TimeTracker. I want to add a calendar for showing Reports. As I know that XCode/iOS doesn't provide any calendar tool(like Date Picker).What should I use ?

Thanks

EDIT : Thanks for the quick response guys (Mayur , John and Yoko). It's really pretty tough to accept one answer while everyone's answer开发者_如何学Python is almost same.

Regards Akshay

Yes.

These are the option I am aware of:

1) http://tapku.com/

2) http://github.com/klazuka/Kal

3) http://code.google.com/p/iphonecal (needs to be customized - easily - to change text from chinese to english)

4) Commercial: http://nrg.com.bd/blog/archives/36 but the look & feel of the previous ones is much, much better and they are free, if you can comply with their licenses.

Hope this helps.