At any moment during a football match there are usually three visible clocks showing three slightly different times. None of them is the clock that matters.
The referee holds the only authoritative time
Football's clock lives on the referee's wrist and nowhere else. Every other display is an approximation maintained by someone with no authority to stop or start it.
This is unlike American sports, where a game clock operated at the scorer's table is itself the official time and stopping it is a formal act with rules attached.
Football's design means the referee can add time silently, and the visible clocks continue counting up without knowing how much the match has actually been extended.
Why the stadium clock drifts
The stadium clock is started by an operator on the kickoff whistle and runs continuously. Any delay in starting it becomes a permanent offset for the half.
It also does not pause. Where the referee has stopped his watch for a substitution or a treatment, the ground display keeps going, so the two diverge steadily.
Most stadium clocks are frozen at forty-five and ninety minutes for exactly this reason. Beyond that point the display would be visibly wrong and would invite argument.
Why the broadcast clock is different again
Broadcast clocks are generated by the production and are started from the world feed rather than from the ground. Latency in the feed introduces its own small offset.
Different broadcasters covering the same match therefore show times that differ by a few seconds. Viewers switching between feeds occasionally notice, and the discrepancy is real.
Goal times published by broadcasters come from these clocks, which is why the same goal is sometimes reported in different minutes by different outlets.
How the official minute is fixed
The recorded minute of a goal comes from the match report and from the competition's own timing operation, which works to the match officials rather than to a broadcast.
Because minutes are recorded as whole numbers, a goal near a boundary is assigned to one minute or the other by a rounding convention rather than by measurement.
Data providers may record more precisely, but their precision is not the official figure. Two records of the same goal can be internally consistent and still disagree.
Why nobody has fixed this
Making the stadium clock authoritative would require football to adopt a stopped-clock model, which changes how the game is played and has been resisted for decades.
Proposals to do so recur, usually justified by the growth of added time. They are arguments about the sport's structure, not about display accuracy.
Until the model changes, the disagreement is unavoidable. Three clocks measuring different things will produce three answers, and only the wrist counts.

