If آپ want to wish "Happy New سال " to someone in Greece, then آپ should say: Kali Hronia.
For "Happy New سال Day" in Greek آپ should say "Kali Protohronia".
If your friend is called Manolis یا Hristos, his nameday is on December 25 (Christmas day). Wish him "Hronia Polla" (Many Happy Returns) for his nameday.
The same applies if your friend is called Vassilis, Yiannis یا Fotis. Vassilis nameday is on January 1, Fotis' nameday is on January 6, Yiannis' nameday is on January 7.
During Christmas holiday period, which lasts from December 24 until January 6, plus a couple of weeks past that, it is a custom in Greece to wish "Hronia Polla" to the people آپ meet. So, if آپ meet someone in the morning, the proper way to greet him یا her is: Kalimera, Hronia Polla! (Good morning, Many Happy Returns).
