When you daven Maariv early (right after plag hamincha) on Rosh Chodesh, it seems you shouldn't say Yaaleh VeYavo.
- Why is this, since it's still day time and hence still Rosh Chodesh?
- If you then eat a meal (after you davened Maariv, but while it's still daylight), would you need to say Yaaleh VeYavo in bentching?