tenses - Today Was vs Today Is - English Language & Usage Stack Exchange
In my town, people with PhD's in education use the terms, "on today" and "on tomorrow." I have never heard this usage before. Every time I hear them say it, I wonder if it is correct to use the wor...
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Today means "the current day", so if you're asking what day of the week it is, it can only be in present tense, since it's still that day for the whole 24 hours. In other contexts, it's okay to say, for example, "Today has been a nice day" nearer the end of the day, when the events that made it a nice day are finished (or at least, nearly so).
Neither are clauses, but "today in the afternoon" is grammatical (adverbial phrase of time), while "today afternoon" is not. I would also suggest "this afternoon" as a more succinct and idiomatic alternative to "today in the afternoon".