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.
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It does, however, indicate that the following "contemporary" stories of The Android Invasion and The Hand of Fear would have to take place in or after 1980 as Sarah encounters Harry and leaves in the two stories, respectively.
The Seeds of Doom does not necessarily have to fit here. This story firmly and explicitly has the Brig retiring from UNIT in 1976, the year The Seeds of Doom came out.
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.
In Pyramids of Mars, however, it is claimed several times that Sarah Jane Smith is from "1980", and they briefly revisit the year.
Since she was the Third Doctor's final companion, and spent a good deal of time at UNIT, this has some implication for the theoretical date of UNIT stories set in seasons 11 - 13.