Nov 20, 2014 ·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. Feb 29, 2016 ·Two other options (in addition to "as fromtoday," "fromtoday," and "effectivetoday") are "beginningtoday" and "as oftoday." These may be more U.S.-idiomatic forms than British-idiomatic forms (the two "from" options have a British English sound to me, although "effectivetoday" does not); but all five options are grammatically faultless, I believe. For instance, consider the sentence, "I ate lunchtoday." Is it necessary or acceptable to put a comma before "today?" Generally speaking, some of these time phrases look wrong to me when used wit... Todaymeans "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, "Todayhas 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).
