The status of the Gregorian calendar was unclear between 1916 and 1921 while China was controlled by several competing warlords each supported by foreign colonial powers.
Status kalender Gregorius tidak jelas antara tahun 1916 sampai 1921, di saat Tiongkok dikendalikan oleh beberapa panglima perang yang saling bersaing, dan didukung oleh kekuatan kolonial asing.