Solution: All of the above: (The 1st of January):
2018 (The 19th of December 2018 in the Julian calendar)
2019 (The 1st of January, Gregorian calendar)
5779 (Tevet 24, Judaism)
1440 (Rabi’ ath-Tani 24, Islam)
1397 (Dey 12, Persia)
1940 (Pausa 12, India)
_Source 1 Source 2
(and Wikipedia)