Reading and translation for "1日目", "2日目", "3日目", etc


I have a list referring to days of classes that reads this way:

  * 1日目 - Ichinichime - Day 1
  * 2日目 - Futsukame - Day 2
  * 3日目 - Mikkame - Day 3
  * 4日目 - Yokkame - Day 4
  * 5日目 - Itsukame - Day 5

And so on (until 25).

Why is the romanization of the first day written in Sino Japanese and the rest
in native? Shouldn't the English translation be instead "First Day, Second
Day", etc.?




There is a usage difference between [一日]{ついたち} and the rest.

While [二日]{ふつか}, [三日]{みっか}, etc. can refer to both the _n_ th day in a month
and _n_ days, [一日]{ついたち} is used for the meaning _first day of the month_ and
not _one day_.

The reason is due to the etymology of ついたち, which is a contraction of
[月]{つき}[立]{た}ち (literally _the rise of the month_ > _start of the month_ ; see
related: [Why is 一日
'tsuitachi'?](https://japanese.stackexchange.com/questions/53068/why-
is-%E4%B8%80%E6%97%A5-tsuitachi)), so the word doesn't have anything to do
with _one_ or _day_ ; the _kanji_ used are
_[jukujikun](https://en.wikipedia.org/wiki/Kanji#jukujikun)_. The other
_kun'yomi_ are actually native Japanese numbers which count days.

For the count of one day, 一日 can also be pronounced いちじつ, but this is slightly
rarer.

