Today had been the worst day of my life. I think it is a good question. Neither are clauses, but today in the afternoon is grammatical (adverbial phrase of time), while today afternoon is not.
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Seems awkward, as today is not understood to mean on this day (the original meaning). What are the origins and history of using on tomorrow, on today, and on yesterday ** (which in standard englishes are just. The phrase our today's meeting is commonly used in indian english, even though other dialects of english frown upon it.
When there is yesterday morning and tomorrow morning, why have an exception for this morning (which means today's.