When Does "Highlander: The Source" (2007) Take Place?
"Highlander: The Source" is a fantasy film written by Joel Soisson with Steven Kelvin Watkins that released September 15th, 2007. So when is "The Source" set?
It takes place roughly in the year:
We know this because Duncan MacLeod says, "I spent the last 400 years cutting people’s heads off to survive".

~2010s? AD
We know this because Duncan MacLeod says, "I spent the last 400 years cutting people’s heads off to survive".
Duncan’s birth year is stated as 1592 AD in the film. This would place us around 1992 AD but we know he is rounding down as this period was passed by much earlier in the TV show "Highlander: The Series" (1992), which this movie is a sequel to.
1,592 + 400 = 1,992.
More specifically, it must take place after "Highlander: Reunion" (2008), which takes place in 2003 AD, at the earliest. So it must be after 2003 AD.
It is otherwise unplaceable.
The hallmark of the Highlander series is major flashbacks to historical periods. There is a flashback only referred to as "before recorded time" and is therefore also unplaceable.
It is the chronologically second-to-last film in the Highlander universe (the second to feature Duncan MacLeod) and can be watched at its timeline point, either after watching the TV series or after watching "Highlander III: The Sorcerer" (1994).

