But it is because the referee is the official timekeeper that you can’t have a visible display of the clock. He often needs to make corrections to the amount of time left in a half because of time lost due to injuries, substitutions, and deliberate time-wasting by players. If the referee had to make the effort to press some little buttons or something that would send a signal to a clock in the stadium and change the amount of time, then he would not be able to concentrate on officiating the match.
Further, if the referee could adjust a displayed clock while the game was going on then imagine what would happen if say, the home team was up 1-0 late in the match and the ref kept adding time (or just stopping the clock) because the home team was deliberately delaying the game. The home fans, who could now see exactly when time was added and how much was added, would go nuts and possibly even riot.
Currently, they now display approximately how much stoppage time will be added near the end of each half. I think that’s a decent idea, but you can see how pissed off the fans get if the referee blows his whistle either a little earlier or later than the time that was indicated on the board.
If you want to keep track of the match time do what everybody else does (including the managers and the assistant referees. And if it’s good enough for them, then I think you can live with it too). Note the time that the match starts and then add 45 minutes to that. That is when the half will end unless time needs to be added for stoppages.
It is certainly a bad idea to have the official time displayed in the stadium. They do that in USA college soccer (or at least they used to) and it is part of what is so very, very bad with their brand of soccer.
SIDE NOTE: I and many others (I think) believe that college soccer has had a terrible effect on America’s ability to progress at the international level. It has, and continues to, set us back years–maybe decades.
And, the bastardization that is NCAA soccer accounts (in part) for why Steve Sampson was such a bad manager, and although he was a pleasant change at first (mostly just because Sampson was gone), it’s why Bruce Arena was a bad manager too.
Bring back Bora! (Okay, maybe not Bora, but USA Soccer desperately needs their new manager to have cut his teeth in top-level international soccer.