Religious Days of Significance

(Jewish) Tu B'Shevat is the New Year for the purpose of calculating the age of trees for tithing.

(Buddhist) In Mahayana countries the new year starts on the first full moon day in January and is celebrated for three days.

(Sikh) Commemoration of the martyrdom of the Forty immortals (followers of Guru Gobind Singh).

New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the Julian Calendar.

Buddhism.

(Christian - Coptic & Eastern Orthodox) On this day, some Eastern churches celebrate the birth of Jesus according to the Julian calendar, which is currently 13 days behind the Gregorian or Western calendar.

Christianity

Sikhism

Buddhism.

New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar (Wikipedia)

Kwanzaa is a celebration held in the United States and in other nations of the African diaspora in the Americas and lasts one week. (Wikipedia)