Their appearance different is the sentence has 'A' whether or not, but I have heard both... What's their difference? or no difference?

  • A happy new year is a noun phrase. Happy new year! is an exclamation. Both are correct. – user178049 Jan 1 '17 at 4:55

A happy new year

This would be said in a sentence like "have a happy new year!". It treats "happy new year" as an object.

Happy New Year

This is just another saying that you tell someone on new years.

Both "have a happy new year" and "happy new year" are both acceptable things to say to someone on new years eve/day.

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