Everything sounds great! Now I am looking forward to the next updates even more.
Concerning the battalions command and micromanagement: The ability to split and merge the regiments would probably solve the issue for me. I am generally in favor of less micromanagement (that's why I like games like Command Ops 2 or Graviteam Tactics: Mius Front), but if there would be scenarios, where you have only like 2 or 3 regiments, then even commanding each individual battalion wouldn't be too much micro. But splitting the regiment in half or something like that would be probably enough.
Yes, the format Day XX – XX:XX would be even better.