2nd flight change from Delta-- changed Nov return flight from Tuesday to Monday.. Now changed same flight from Monday to Sunday- 2 days shaved off vacation ...ugh
I'm in the same boat.

First, they changed our outbound flight. The connection in Atlanta was going to leave THE DAY BEFORE we get to Atlanta...lol
While I pondered that issue they changed our return flight to THREE DAYS earlier.
Now I'm super angry and looking at lots of $$ to rebook with another carrier. And as everyone is pointing out, that will be a crapshoot as well.