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I've heard people using あした (the common one) and あす (rather uncommon) to refer
to "tomorrow".

I was wondering does anyone actually uses the reading みょうにち ?
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2011-07-26T19:10:20.090
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word-choice words readings spoken-language wago-and-kango
Do people actually ever say みょうにち?
Sometimes old people do. I don't know why, but maybe they feel uncomfortable
with 熟字訓読み as in あした or あす, where the portion of the pronunciation of a word
does not match each kanji character.
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2011-07-26T19:38:40.807
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I have heard it used in formal (e.g. business) contexts. I have never heard it
used in casual conversations among friends or family.

This is what you might expect, because Sino-Japanese words like みょうにち do tend
to have a more formal feel than native Japanese words like あした or あす, when
they exist alongside each other with similar meanings.
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2011-07-26T23:48:03.390
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In some parts of Tohoku, the greeting "おやすみなさい" or "また明日" is said "おみょうにづ",
with is a deformation from "おみょうにち". Even though it refers to the _next_ day,
I think that "お" is the same one as in "お早う".

I can't remember whether "あした" is casually said "みょうにづ" though…
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2011-07-27T02:10:53.097
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