Regardless of #202205102222, to greet in #202205102217, one can say Hallo if first met, and Doei before leaving. The alternatives for Hallo are Hoi (often) and Hey. Doei alternatives are Doeg, Dag (means day) and Tot ziens.
To be more formal, say the greetings according to #202205102222 with the prefix Goeden. For example, Goedenavond, meaning good evening. Use Goeie prefix if you want the conversation to be less formal, that is for everyday cases. Goeiemorgen means good morning, which is the same as saying Goedenmorgen.
Weirdly enough, Dutch people wave goodbye by saying Goedendag or Goeiedag in formal or everyday cases. Both of them mean good day if translated literally which can be used to greet too.