The poem describing the time in "The day of hoeing is at noon" is "The day of hoeing is at noon". This sentence means that farmers are hoeing under the scorching sun at noon.
Source: Tang Dynasty Li Shen's "Two Poems of Compassion for Farmers" No. 2: "It's noon on the day of hoeing, and the sweat is dripping from the soil. Who knows that every grain of food on the plate is hard work?"
Translation: Farmers are hoeing under the scorching sun at noon, sweat dripping from their bodies on the land where the seedlings grow. Who knows that every grain of food on the plate was earned by farmers through hard work?
Extended information
Appreciation of the second poem of "Two Poems of Compassion for the Farmers":
The beginning of this poem describes how farmers are still working in the fields at noon under the scorching sun. Working there, every drop of sweat is sprinkled on the scorching land. This adds that from "one grain of millet" to "ten thousand grains", to "there is no idle land in the world", it is watered by thousands of farmers with their blood and sweat; this also explains why "every grain of millet" below has worked hard. It captures the most typical image, which can be said to be equivalent to ten.
The poet finally said in a rhetorical tone, "Who knows that every grain of food on the plate is hard work" is very convincing. In particular, the comparison of grains of food to drops of sweat is vivid and appropriate. The language of the poem is popular and simple, the syllables are harmonious and bright, catchy and easy to recite, which is why these two poems have been circulated among the people for a long time.