In the Christian world, the custom of New Year began after 325 ce when Constantine decreed that the Feast of the Circumcision would be the beginning of the New Year. Since a circumcision among the Jews is a joyous celebration and since Jesus was/is the King of Christian theology, it became an excuse to have a bolstrous party. The custom has grown for several centuries.
Other non Christian countries celebrate their New Year according to their customs/religious heritage. Islam has it's own "New Year" as do the Jews, the Buddists, the Shintoists, ect. They can and do vary according to that particular faith's calendar which is usually different than the Christian one.
1 Resolution: This Year I will play with my little sister more.
2 Resolution: My second resolution i am going to raise my grade at math to a higher grade.
3 Resolution: At School i promise to be nice with my friend.