Set an environmental variable with the date on year in the future

Question

I can run this command on my Mac:

exp=$(date -v+8760H +"%Y-%m-%dT%H:%M:%SZ")

I then run: echo $exp and it produces the desired result i.e. 2021-04-20T09:06:44Z

I then modified the command to run it on a Linux box:

exp=$(date -d '+8760 hour' +"%Y-%m-%dT%H:%M:%SZ")

I also need to run this command on a Windows 10 box. What is the command for Windows? I have managed it on Linux and Mac, but not Windows.