How to create SVN diff patch file

Is there any way I can create SVN patch file for diff.
Tortoise SVN on windows provide this feature - you have to go to SVN folder, 
right click and then select "patch". This will create a patch file of SVN 
differences.

This is needed at places like Review Board.

Please let me know if this feature is available and how to use it.

Something on these lines - 
https://ariejan.net/2007/07/03/how-to-create-and-apply-a-patch-with-subversion/

Thanks and Regards,
Sagar

Original issue reported on code.google.com by sagrian....@gmail.com on 7 Nov 2014 at 2:08

justinshang / svnx

How to create SVN diff patch file #215