Questões de Concurso Público Prefeitura de Ilha de Itamaracá - PE 2023 para Professor de Inglês

Consider the following excerpt from 'Alice's Adventures in Wonderland' by Lewis Carroll: 'The Queen of Hearts, she made some tarts, All on a summer's day: The Knave of Hearts, he stole those tarts, And took them quite away!'. Which preposition of time is used in this excerpt and how does it contribute to the overall meaning of the poem?