“One of these days” in Japanese
Short answer
One of these days in Japanese is “いつの日か” (itsunohika). Full meaning: one of these days, someday, one day.
Other ways to say “One of these days” in Japanese
いつの日にか
itsunohinika one of these days, someday, one day
いつかそのうち
itsukasonouchi one of these days, before very long, in the near future
その内
sonouchi before very long, soon, someday, one of these days, sooner or later; of the previously mentioned, of that number, among them, among others
その内に
sonouchini before very long, soon, someday, one of these days, sooner or later
近日中に
kinjitsuchuuni in a few days, in the near future, soon, one of these days
Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.