Expectedly, this leads to desynchronization and outdating.
Include release dates in release notes
This is thread is not specifically about this page, but about the many subpages it has (one for each X.Y release; e.g., Release notes/1.22). It would be helpful to include in each version section the date that it was originally released.
I aggree it would be an interesting information on these pages. I just collected some data about the releases, so now these informations can be found in a central page, although this page is a bit heavy and difficult to read; and they could be used to write down the important dates on the release notes pages.