Tracking edits of one column only

edited 12/09/19 in Smartsheet Basics

I'm trying to track when end dates are changes in the project plan. I've added a system-generated column that will show when a whole row is modified, any way to limit that to one column? I need reporting capabilities that aren't possible with the activity log or cell activity functions.  It also would be great if there was a conditional formatting rule for "is changed" for the date field!

Any ideas greatly appreciated! Thanks!