It's 32 days if end date is included. I didn't include end date in the 31, but I think end date is included. Q gave examples of using days apart as comms in a post.

The Supreme Court overturned abortion on 6/24 which was 6 months and 24 days after it was argued on 12/1/2021 IF you include end date. But given it lines up perfectly with end date I'd say it's most logical to include the end date.

So the above pattern might also be 32 if you could go with end date. 31 days if not end date.