No one has written the code to compute that yet. Feel free to submit a patch. <https://sqlite.org/copyright.html> (There is no %V in the documentation, and the %w and %W are considerably different from your quoted text, so clearly you are quoting from something else that calls something strftime. You should complain to the "things of the same name should do the same thing in the same way" guy, but he has been over at Microsoft trying to explain the concept to them for the last 40 years...)