Dec 12, 2016 · WIthin the context of this dialect, the formation "on today" and "on yesterday" would be considered correct by those speakers, or they wouldn't be saying it that way. However (and I cannot back this up with a citation), in general, most English speakers in the US would not use "on" before "today" or "tomorrow."

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).

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No, "as of" can mean both - 1) As of today, only three survivors have been found. 2) As of today, all ...

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May 22, 2017 · I was editing a piece recently and saw this structure "Once you have ran the process, you ..." I have always used "have run", but wasn't sure if "have ran" is acceptable in modern English.

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Nov 20, 2014 · 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. –

Sep 10, 2012 · today O.E. todæge, to dæge "on (the) day," from to "at, on" (see to) + dæge, dative of dæg "day" (see day). Generally written as two words until 16c., after which it usually was written to-day until early 20c. Similar constructions exist in other Germanic languages (cf. Du. van daag "from-day," Dan., Swed. i dag "in day").