So I'm confused as to how these words are to be used. Bonsoir means good evening, or can be used to say hello in the evening time. An example of bonsoir is how someone would greet another when walking into a Paris restaurant for dinner. Now Bonne soirée means 'have a good evening'. My question is this; can it also be used to greet someone in the evening time, or is it used when you're about leaving a place like you would say 'have a great day'.