《旧唐书·本纪·卷十七》
大和六年春正月初一为乙未日。因久雪取消元旦朝见仪式。
六年春正月乙未朔，以久雪废元会。
On the first day of the first lunar month in the spring of the sixth year of the Dayun era, it was the day of Yiwei. The New Year's Day court was canceled because of the heavy snow.