How do I checkout a previous svn version in xcode 4

I have local svn repository. I created it with the svn command line tools and then attached to it using xcode 4. I checked out my project to a folder. I used this working copy and comitted several versions. Everything is working good in terms of being able to see changes between versions and so forth. I would now like to checkout an old version as it was on one of the days I commited it. Can someone please tell me how? You guidence is very appreciated.

 

Thanks for the reply. I think from what I understand about the post. the reverse merge thing will change my working copy. What if I don't want to modify my working copy which I think is what reverting will do. I really just want to pull out a snapshot of the code as it was to a directory that is not the working copy. Can you descrbe how I can achieve that? When you use svn in Windows you can checkout any version and place it anywhere you want which is really what I would like. Is there a command line that can achieve that?