The dating doctor
However, the events of The Invasion, the first story in which UNIT properly appears, approximately occurred in 1979.
Thus, the UNIT dating controversy is, broadly speaking, an attempt to understand how the Brigadier could have retired from UNIT before UNIT even existed.
Writer Ben Aaronovitch has notably opined that there is simply no way to retcon the problem.
Terrance Dicks has said he deliberately avoided giving dates during his time as script editor precisely so he could avoid these sorts of continuity headaches.
Consequently, the biggest period of UNIT involvement, the Third Doctor's era, has only comparatively mild contributions to the dating controversy.
No television story actually featuring UNIT gives a clear year. It implies at one point that Jo Grant had just said the year, but Terrance Dicks was keen to keep the dating deliberately vague.
Dave speak in person and the one thing he consistantly conveys is that you can have a successful relationship with anyone - if you just have the right information to work with.
Because it's flatly impossible to have the Brigadier retiring before he's even become the Brigadier, a fundamental discrepancy indisputably exists in televised Doctor Who narratives.
It has also been the subject of a 2|entertain DVD documentary, The UNIT Dating Conundrum, included in the special edition release of Day of the Daleks. These have most prominently included a sly remark made by the Tenth Doctor in The Sontaran Stratagem and on-screen graphics seen in The Lost Boy — but writers in other media have occasionally referenced the controversy, or attempted to solve parts of it.
The Enfolded Time solves the UNIT dating controversy stating that due to the Doctor's numerous visits to the 1970s and 1980s in his faulty TARDIS, the two decades merged into one making 20 years of history happen in 10 and the obvious mix around of some of this history.
Coleman is known nationally as "The Dating Doctor." He has been interviewed by CNN, WGN, ABC, NBC, Fox, and CBS. How to Stop Revolving and Start Evolving in Relationship, 101 Great Dates, and Let Your Leadership Speak. Instead, open your mind, read this book, and get that relationship you've always wanted (and that you deserve! Buy Rod Novichkov's How to Find Yourself and Your Best Match.
He also writes for publications such as Glamour, Cosmopolitan, USA Today, the Washington Post, The New York Times, and The Wall Street Journal.
In Pyramids of Mars, however, it is claimed several times that Sarah Jane Smith is from "1980", and they briefly revisit the year.