Which of the following is NOT a preposition of time?

A part of the sentence that is used to express a relation with another word or part of a clause is called a preposition. For example, in the sentence, "my books are in my cupboard," the word 'in' is a preposition. Depending on the uses and functions, a preposition is of several types. One of the types is the preposition of time, which is used to show when something is happening. In the given question, "in", "from", and "since" are prepositions of time. Thus, only the word 'into' is not a preposition of time. Instead, it is a preposition of position.