How to say "someday" in Japanese

• そのうちJLPT N3approx.Common
  expression, adverbCovers 'someday' in the sense of 'one of these days, before long': something expected to happen fairly soon without a set date, as in putting off a task you intend to get around to. Usually written in kana.
  そのうち一緒いっしょに仕事しごとができるといいなと思おもっています。↗

  Hope we can work together soon.
• そのうちにCommon
  expression, adverbSame senses as そのうち: 'soon', 'before very long', or 'someday'. The particle に does not noticeably change the meaning, so the two are effectively interchangeable in most contexts.
  「そのうちに、あなたのところにお邪魔じゃましてもいいですか」「どうぞ、どうぞ」↗

  "Do you mind if I call on you sometime?" "No, not at all."

Both words cover the same senses—'soon', 'before long', or 'someday'—and differ mainly in form: 「そのうちに」 adds the particle に, without changing the meaning appreciably.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• そのうちbefore very long
• そのうちにbefore very long
• いつかsometime
• いつの日にかいつのひにかone of these days
• いつの日かいつのひかone of these days
• ゆくゆくin the future
• いずれsooner or later