If you want to refer to the time of the day, you can say :
- "Magandang araw" - "good day"
- "Magandang umaga" - "good morning"
- "Magandang hapon" - "good afternoon"
- "Magandang gabi" - "good evening"
When saying goodbye, a nice (but rather formal) way to take your leave is to say "Paalam" (goodbye).