'Magandang hapon.'
"Magandang gabi" you could also say "Magandang gabi po", "po" was included to show respect. For example "Magandang gabi sa'yo" (Good evening to you) or "Magandang gabi po sa inyo" (Good evening to...
swertehin ka sana, swertehin ka sana,
magandang gabi.....
Magandang Umaga <- Informal Magandang Umaga Po <- Polite