"Good day" as "良い一日": Yoi ichi-nichi vs Yoi tsuitachi?


  1. Do Japanese say "Good day" as the conventional way of their greetings (?):

> 良い一日。(?)

  2. Furthermore, it seems that:

Google pronounced this as

> Yoi ichi-nichi.

But the Google translator shows:

> Yoi tsuitachi.




The _tsuitachi_ reading is restricted in meaning, and can only be used to
express "the first day of the month". It's spelled 一日 ("one; first" + "day")
in kanji, but it originally comes from [月]{つき}[立ち]{たち} ( _tsuki tachi_ ,
"month" + "starting off").

Both readings are possible in the limited context of your sample string:

  * 良い一日 → _yoi ichinichi_
  * 良い一日 → _yoi tsuitachi_

Which reading you should use depends on your intended context. Are you talking
about "a good day", or are you talking about "a good first day of the month"?

If instead you're trying to translate the greeting _" good day"_, then neither
is correct, and you should use the term こんにちは ( _konnichi wa_ ) instead. See
also [the "Translation" section in the Wiktionary entry for "good
day"](https://en.wiktionary.org/wiki/good_day#Translations).

