The owner of the club just accepted to build a new stadium. But to create the plans it takes 2 years + the building time. Is there any way to edit this date on fmrte? And can i edit the plan of the new stadium, like capacity?

Moved to correct forum.  As far as I am aware, you can't edit the date nor the capacity during the work.  I have not encountered this yet in game so I can't say much on the matter.  I am sure someone here has your answer.

Hi

I have checked Everton's new stadium as an example-

 

 

I was able to change the build date

 

However I believe that games will be played at Goodison as the game will generate fixtures to be played there for at least the up coming season

 

The best way to resolve this is to either set up a new stadium/move date etc in the pre game editor to your exact requirements, or just increase the capacity in your current stadium using FMRTE to what you want it to be, then when the new stadium is built just increase the capacity once again to the desired amount

closing answer given PM me if this needs to be reopened