77704
I've learned that the 1st to 10th day of the month is always read specially.
However, when I converted these by using my computer typing
"いちにち、ににち、さんにち、よんにち、ごにち、ろくにち、ななにち、はちにち、きゅうにち、じゅうにち、じゅうよんにち、にじゅうにち、にじゅうよんにち",
these converted correctly. Especially, one-letter day expression can only be
found when you convert correctly. For example, if you convert "よっか" or "よんにち",
you can get a letter "㏣(IDEOGRAPHIC TELEGRAPH SYMBOL FOR DAY FOUR)". But, if
you input "しにち" or "よにち", the letter is not shown within the candidates. I've
learned that when you use generic counter for 1 to 10, you can use either "つ"
or "こ". But, when you refer to over 10, You cannot use "つ", only "こ" can be
used.

i) I wonder that the 1st to 10th, 14th, 20th and 24th day of the month also
can be read as both "か" as "にち".

ii) And I wonder if I use "にち", the meaning is changed.![enter image
description here](https://i.stack.imgur.com/EfxUd.jpg)
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2020-05-29T06:52:07.137
77696
2020-05-31T03:52:27.930
2020-05-31T03:52:27.930
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question
numbers
The day of the month
First of all, "にち" is available for every case but "か" is not. "か" is
available only for 2,3,4,5,6,7,8,9,10,14,20,24 when you refer to a day.

> i) I wonder that the 1st to 10th, 14th, 20th and 24th day of the month also
> can be read as both "か" as "にち".

Yes! The both are possible. In my sense, when we call a date on calendar "か"
sounds more popular than "にち" if it's available (i.e.
2,3,4,5,6,7,8,9,10,14,20,24).  
The exception is 1日 which sounds "ついたち" or "いちにち". I think ついたち sounds popular
when I say "1st May" for example.

Similarly, When we call period of days (e.g. for 2 days), my sense is the same
as above. To call 2日間, 3日間, 4日間, ..., ふつかかん, みっかかん, よっかかん, ..., とおかかん,
じゅうよっかかん, はつかかん, にじゅうよっかかん sounds more popular than "にち" pattern.  
We will never say ついたちかん. Because ついたち especially means the 1st day of the
month. It doesn't mean just one day. We call "いちにちじゅう" (1日中) to say "all day
long".

Furthermore, when we call the Nth day of summer vacation, the both are
possible and "にち" gets popular back compared to the former cases. For example,
"夏休み 8日目" (The 8th day of summer vacation) can be called "はちにちめ" as well as
"ようかめ". The both sound natural enough.
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2020-05-29T11:34:28.580
77704
2020-05-29T13:08:49.740
2020-05-29T13:08:49.740
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answer