Formal:
* Magandang araw po. (Good day)
* Magandang hapon po. (Good afternoon)
* Magandang gabi po. (Good evening)
Informal:
* Magandang araw. (Good day)
* Magandang hapon. (Good afternoon)
* Magandang gabi. (Good evening)
Other options:
* Maligayang pagdating! (Welcome!)
* Kumusta ka? (How are you?)
You can choose the appropriate greeting depending on the context and your relationship with the person you are greeting.