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What is the difference between 日{ひ｝ and 一日｛いちにち}? I thought that 一日 was used
when refering to the **length** of a day but I saw this sentence and got
confused:

> 今朝のニュースでも、アナウンサーの人が「うららかな **一日** になるでしょう」って言ってたよ。
>
> Also, on the news this morning the announcer said that it would probably
> become a beautiful day.

Why is it correct to use 一日 rather than 日 here? Thanks.
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2015-10-25T16:15:56.520
28870
2015-10-26T04:19:46.133
2020-06-17T08:18:27.500
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question
grammar time
Difference between 日 and 一日
一日 means either the first day of the month or one day, but can also mean all
day.

In that context, 一日 is used to denote that the **whole** day will be
beautiful.

Anyone please correct me if I'm wrong, I'm still learning myself.
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2015-10-25T19:09:55.303
28871
2015-10-25T19:09:55.303
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answer
The concept of a day is quite ambiguous in any language and Japanese is no
exception. A day can be: 24 hours, a calendar day, a period between sunrise
and sunset, a period between you wake up and go to sleep, one's workday. One
day might have more than 24 hours (長い一日だった), the other less...

That said 一日{いちにち} in your example refers to a time period that someone
perceived or might perceive as a "beautiful day". It is essentially 一日間 here
and although using it would be unnatural, it would probably be grammatical.

Like in 忙しい一日でした the 間 is absent, but if you extended the period to two weeks
you would say 忙しい2週間でした.

日{ひ} on the other hand has more of a "calendar day" or an "exemplary day"
feeling to it. うららかな日は外で遊びます。
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2015-10-26T02:41:02.603
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2015-10-26T04:19:46.133
2015-10-26T04:19:46.133
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answer