Calendar not showing the weeks properly.

Hi

Calendar in portal not showing the no of weeks properly.

Year 2009 has 53 weeks but in portal it is showing has 52 weeks.

In backend I could see it has 53 weeks.

What could be the problem

Please find the screen shot below.

[http://www.flickr.com/photos/46053232@N06/4227498863/]

Thanks in adavnce.

Thanks

Ravi