The phrases " on tomorrow," " on today," and " on yesterday " are commonly heard in the southern region of the United States. They are acceptable in casual speech and other informal contexts, but should not be used in formal contexts such as academic writing.
american english - Origins and history of "on tomorrow", "on today ...
3 “Earlier today” is a totally correct way to refer to a point in time between the beginning of the day and the current time. Because it refers to a moment in the past, it can be used with the past tense, as you did in your example.
In old books, people often use the spelling "to-day" instead of "today". When did the change happen? Also, when people wrote "to-day", did they feel, when pronouncing the word, that it contained two
Change from to-day to today - English Language & Usage Stack Exchange
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).
Today Was vs Today Is - English Language & Usage Stack Exchange
Which of the following is grammatical? What date/day is it today? What date/day is today?
I think it is a good question. When there is yesterday morning and tomorrow morning, why have an exception for this morning (which means today's morning)? Yes, idiom, but I actually do like idiomatic extensions like these - as long as everybody knows what is meant and no grammar or semantic rules are violated...
The 2002 reference grammar by Huddleston and Pullum et al., The Cambridge Grammar of the English Language, would consider words like yesterday, today, tonight, and tomorrow as pronouns (specifically, deictic temporal pronouns). Related info is in CGEL pages 429, 564-5.
Two other options (in addition to "as from today," "from today," and "effective today") are "beginning today" and "as of today." These may be more U.S.-idiomatic forms than British-idiomatic forms (the two "from" options have a British English sound to me, although "effective today" does not); but all five options are grammatically faultless, I believe.
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".
word choice - 'Today afternoon' vs 'Today in the afternoon'? - English ...
No meetings scheduled today vs No meetings scheduled for today. When we want to specify that the statement which is talking meetings about to happen that day. Which one to use?
grammar - No meetings scheduled today vs No meetings scheduled for ...