Dating in the 1980 s Canada tchat adult
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.
The problem, which arguably should be called "the Brigadier dating controversy", exists primarily because of two appearances of Alistair Gordon Lethbridge-Stewart when he wasn't employed by UNIT.
One possibility given by The UNIT Dating Conundrum is that the entire lot of UNIT stories from Spearhead from Space to The Seeds of Doom (where the Brigadier is still in UNIT but away in Geneva) happens from 1979 to 1980; if Sarah is speaking of her "home time", i.e.
the time she (and Harry Sullivan) left with the Doctor, that would imply Planet of the Spiders, Robot, and possibly Terror of the Zygons when Harry leaves the TARDIS, would take place in 1980.
Viewers got no dialogue with a firm year for the whole of the Third Doctor's era.
In Pyramids of Mars, however, it is claimed several times that Sarah Jane Smith is from "1980", and they briefly revisit the year.