Round Off Total Days

Hi, i have a very simple custom column (col name is TAT). the equation is "=date1-date2".
I want to create a summary and get the average of TAT column per month. however the result shows me number of Days, Hrs, Minutes, and Seconds in this format DD HH:MM:SS.sss. i want to round this number so it only give me days. I can't seem to find the function. here's a screenshot of the table.

What's the database?

Hi @doncube
You are looking for this: - upvote by clicking :+1: on the first post