If anda want to wish "Happy New tahun " to someone in Greece, then anda should say: Kali Hronia.
For "Happy New tahun Day" in Greek anda should say "Kali Protohronia".
If your friend is called Manolis atau 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 atau Fotis. Vassilis nameday is on January 1, Fotis' nameday is on January 6, Yiannis' nameday is on January 7.
During natal 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 anda meet. So, if anda meet someone in the morning, the proper way to greet him atau her is: Kalimera, Hronia Polla! (Good morning, Many Happy Returns).
