Late autumn and early winter. The poem reads: "Luoyang Road, Heyang, northeast of Luoyang City. Prime Minister Guo Zaitan, Yunmeng Zefeng. Farewell words advise, the wind is bright and the festival is long. Furong Banner surrounds Yuanmen, and the moonlight shines on the ditch. " The "high winds and bright days" here refer to the climate in autumn, while the "hibiscus flag around Yuanmen" is the scene of hibiscus flowers blooming in autumn. So we can be sure that this poem was written in late autumn and early winter.