Ignore me I’ve solved this!
Though I have spotted something that needs fixing:

The Date Added column on the left is manually inputted, the column on the right uses the formula DATEADD({Date Added}, 10, ‘day’).
However, the column on the right is not inheriting the calendar formatting from the column on the left. (I’ve set it as European on the left column, but the formula column defaults to the U.S. style with no way to modify)
This will be very confusing, especially on days that fall between the 1st and 12th of the month.
Ignore me I’ve solved this!
Though I have spotted something that needs fixing:

The Date Added column on the left is manually inputted, the column on the right uses the formula DATEADD({Date Added}, 10, ‘day’).
However, the column on the right is not inheriting the calendar formatting from the column on the left. (I’ve set it as European on the left column, but the formula column defaults to the U.S. style with no way to modify)
This will be very confusing, especially on days that fall between the 1st and 12th of the month.
This link might help you: https://support.airtable.com/hc/en-us/articles/203255215-Formula-Field-Reference#date_and_time_functions
Have a look at the function named DATETIME_FORMAT
This link might help you: https://support.airtable.com/hc/en-us/articles/203255215-Formula-Field-Reference#date_and_time_functions
Have a look at the function named DATETIME_FORMAT
how do i send you a private message? i need work for hire with airtable data base web site. i am at dc295@cornell.edu