KBlogger is a great application; In the 0.6.3 version the developers have fixed KBlogger to the Xml-Rpc standard, which says that <dateTime.iso8601> is the tag to use for the date. Before they have used <datetime.iso8601> and this worked with WordPress. Now the KBlogger team works to fix it in the next release.

gnuton says:
SOLUTION:
Replace “dateTime.iso8601″ strings with “datetime.iso8601″ in kblogger-0.6.3/src/xmlrpcjob.cpp file.