“One day” in Japanese
Short answer
One day in Japanese is “一日” (tsuitachi). Full meaning: one day; all day (long), the whole day, from morning till night; 1st day of the month.
Other ways to say “One day” in Japanese
ある日
aruhi one day, (on) a certain day
１Ｄａｙ
wandee one-day; single-use (contact lenses, etc.), daily-disposable
朔
tsuitachi one day; all day (long), the whole day, from morning till night; 1st day of the month
１日
tsuitachi one day; all day (long), the whole day, from morning till night; 1st day of the month
ついたち
tsuitachi one day; all day (long), the whole day, from morning till night; 1st day of the month
何時か
itsuka sometime, someday, one day, some time or other, the other day, in due course, in time
いつの日か
itsunohika one of these days, someday, one day
いつの日にか
itsunohinika one of these days, someday, one day
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