What does it mean to love green ants at night and keep red mud at night?

Bai Juyi wrote a poem to invite Liu Shijiu to drink: green ants bake new wine, and red stir in the quiet stove. With dusk and snow coming, how about a glass of wine? Simply put, green ants are wine. The night here is long and the red mud is short. In fact, it refers to drinking at night, warming up during the day or drinking around during the day, or drinking from day to night and baking hot wine by the way.