I wrote on the 6.4.1 release vote thread:
One minor problem with both Changes.html files: there is no release date on the 6.4.0 release section. The 6.4.0 release section was never added to the DOAP files under dev-tools/doap/ on branch_6_4. I’ll think about a way of automating a test to prevent this in the future. In the meantime, I’ll add a reminder to sanity check the DOAP files before a release to the ReleaseToDo.