I'm trying to set up a tool inventory, to help keep track of the location of all our big ticket items.
 
I've created a row for each tool.  Asides from various descriptive colums, I have one column set as a drop down list (listing the numerous job sites the tool might be pulled to).  I also have a Date Pulled column, to show when the tool was moved.
 
I want the "date" column to automatically populate to "today's" date whenever the drop down menu changes (regardless of what it changes to). 
 
Any suggestions on a formula?  I'm fairly clueless to smartsheet formulas and functions beyond the basics.
 
Cheers