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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.
The UNIT dating controversy is a problem of retroactive continuity (retcon) which has attracted considerable interest from fans and professional Doctor Who writers alike.
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.
It is further revealed that 1935 was "over forty years ago", tacitly setting The Web of Fear approximately in 1975 if not after.
In the Eighth Doctor Adventure novels Interference - Book One and Interference - Book Two, published in 1999, Sarah Jane Smith is uncertain whether her experiences with the Doctor and UNIT take place in the seventies or the eighties. I think it's currently the 1970s, but —" and is interrupted by Sam Jones.
At the end of the "What Happened on Earth" portion of the second novel, she asks the Doctor about this, and he replies, "Temporal slippage. This solution was later reinforced by The Enfolded Time, where the Accord explains that the Doctor's regular visits to Earth from 1969 to 1989 in his faulty TARDIS disrupted the planet's timeline, enfolding time in on itself so that twenty years occurred over a ten-year period and the Accord is trying to repair the damage to strengthen it before a forthcoming war.
The obvious mix around of some of this history is then handled by the dating protocols.
In The Split Infinitive, the '60s and '70s are said to be being dragged together, crunching the years down.
Ace explains that this will have caused UNIT's timeline to be scrambled, and the Seventh Doctor explicitly references the Brigadier retiring in the 70s and working in the 80s.