Yesterday afternoon that depends on the meaning and the context. The only place where today comes before yesterday is in a dictionary. Yesterday is not an adverb it is a noun.
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Yesterday can be an adverb, a noun, or an adjective.examplesadverb: In english we may say that something happened (or will happen) on a particular day or date (eg: * it was our last afternoon together before the end of the.
You can learn more about adverbs if you look it up in answers.com.
In a dictionary, words are arranged in alphabetical order, so.