I think this would annoy me - yes it's good for him and that's positive, but I bet my arse you wouldn't do the same - you would think "my DD is expecting me back, I can't just let her down" and that's why I would be angry. I think in many relationships with DC the man does just think he can announce that he's going to be away / out or whatever and not consult anyone. I think if he really wanted to stay he could have put it very differently and said "it is so great and I have the opportunity to stay longer, but I know it is short notice, would that be OK with you both, if not I'll come back as arranged." I would tell him when he gets back that in future you'd like to be consulted about decisions like this.
My DP has hobbies that mean he often has to be out in the evenings and I am actually usually happy to manage, but I do insist he asks if it's OK, rather than just announcing it. It makes a difference feeling that he is taking me and DS into consideration.