I found some posts regarding adding a year to a date, and even calculating the FIRST day of a following month. But my effort to reverse engineer these was fruitless. For our contracts, whatever a rep enters as the START date, we want the END date to auto-populate (upon saving) for one year later, but the LAST DAY of whatever that month happens to be.

So I need it to calulate DATE of Start_date__c + 1 year, + 1 month, minus 1 day

That's do-able right? Thanks in advance!!