I am trying to write a function to enable Tableau to calculate the difference between 2 dates, however, they are in 2 different columns and I am having a bit of trouble.
First Opened Date - 10/01/2014
Reviewed Date - 15/01/2014
Obviously, from this example, there are 5 days between the two different columns.
These columns are aligned in rows due to a unique ID.
Any help would be much appreciated!