《汉书·传·王莽传上》
把今年十二月初一癸酉日作为建国元年正月初一，以鸡呜之时作为一天的开始。
以十二月朔癸酉为建国元年正月之朔，以鸡鸣为时。
The first day of the twelfth month, Guiyou Day this year is designated as the first day of the first month of the first year of the founding of the nation, and the time when the rooster crows is designated as the beginning of a day.