The celebration is based on the lunar calendar, so that the first day of the lunar year marks the Chinese New Year.
Nowadays we often hear people sa “Kung Hei Fat Choy” (they want to say “Happy New Year” to you). But do they know what does it mean? Here are different ways to greet someone on a Chinese New Year:
Gung Hay Fat Choy! (may prosperity be with you)
Xin Nian Kuai Le! (Happy New Year)
Gong Xi Fa Cai (congratulations, may you be prosperous)
I guess Xin Nian Kuai Le is more approriate when you want to say Happy New Year.