If you're asking what part of speech "today" is, then according to traditional grammar it can be either a noun or an adverb: 1 . Today is my birthday . [noun] 2.
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If you're asking what part of speech "today" is, then according to traditional grammar it can be either a noun or an adverb:
1. Today is my birthday. [noun]
2. Their behaviour today was atrocious. [adverb]
Modern grammar, however, treats it as a pronoun on the basis that it can't be noun in 1. because it cannot take a determiner (*The today is