Bugzilla-tool should confirm that the date in the ChangeLog entry matches the current date when you land a patch. In particular, when you land-diff. Unfortunately, I realized this the hard way. When I committed change set r51468 <http://trac.webkit.org/changeset/51468>, I noticed the date was from yesterday (11/28). Even though, bugzilla-tool was smart enough to fill in the reviewer, it didn't check the date :-(. Hence, I had to manually commit a fix in change set r51469 <http://trac.webkit.org/changeset/51469>.
This is yet another variant of the same "if you screw up the change log webkit-patch will happily land it, and even screw up your commit-message for you too!" bug. This is very common for git users to hit due to git svn rebase doing the wrong merge thing. :(