Right now I'm waiting for the boarder skrimage to begin, the only problem is, that I can't really see when in how many minuits it starts(only if I click on it, I get the message how long it is going to take before it starts).

Maybe it would be an idea, to place a timer underneath the message which says how late it begins, which counts down untill it begins.
So now it's about 5 min. before it begins, there would just be standing 0:05:23.

I think it's just a small change so easily to put in the game.
You can overlook the situation better and see if you can do something else before it begins.

You can use the command /time to check the current GMT time, then you can calculate the difference yourself easily.

The placeholder mission should say in UTC/GMT when the skirmish will start.

I agree with this suggestion. Unfortunately, it's apparently not as simple to implement as one would hope. Or so I've been told.