《资治通鉴·唐纪·唐纪十一》
当时的《戊寅历》以癸亥为朔日，宣义郎李淳风上表说： 古代历法划分日期确定在子时之半，今年甲子朔日早晨冬至，前太史令傅仁均减除时间稍多，子时初刻即为朔日，所以相差三刻，违背周朝订的天子正朔，请求重新加以考定。 
时《戊寅历》以癸亥为朔，宣义郎李淳风表称： 古历分日起于子半，今岁甲子朔冬至，而故太史令傅仁均减馀稍多，子初为朔，遂差三刻，用乖天正，请更加考定。 
The existing “Wuyin Calendar” regarded guihai as the first day of the month. Li Chunfeng of Xuanyi Lang memorialized: The ancient calendar divided the day with the middle of the night. This year, the winter solstice occurred in the morning of the first day of the month, so the former Taishi Ling Fu Renjun reduced the time slightly. The first hour of the night is the first day of the month, so there is a difference of three hours. It violates the emperor's shuo, which was set by the Zhou Dynasty. It is requested to re-examine it. 