Translation guide
A personal record of daily events, thoughts, or feelings. Japanese distinguishes between a daily journal (日記) and a schedule book (手帳). The most common word is 日記.
A book or digital record where you write about your daily life, thoughts, and feelings.
The standard word for a personal diary or journal. Used for daily entries about one's life.
I keep a diary every day.
Specifically a diary notebook. Emphasizes the physical book.
Loanword from English. Sometimes used for stylish or Western-style diaries, but less common than 日記.
A book for noting appointments, plans, and schedules, not personal thoughts.
A pocket notebook or planner for schedules, memos, and appointments. Not for personal journaling.
A digital diary or blog where entries are shared publicly or privately online.
The standard term for a blog. Often used for personal online diaries.
A record of a journey, often with observations and experiences.
A travelogue or travel diary. Can be a published book or personal record.
日記 is for personal thoughts and daily events; 手帳 is for schedules and practical notes. Using 日記 for a planner sounds odd.
I write today's events in my diary.
Reading my diary reminds me of that day.
新しい日記帳を買いました。
I bought a new diary notebook.
このダイアリーはおしゃれですね。
This diary is stylish, isn't it?
My schedule is written in my planner.
I check my plans while looking at my planner.
Literally 'schedule book'. Emphasizes the scheduling function.
It's time to buy next year's schedule book.
A ring-bound organizer system like Filofax. Refillable pages.
I replace the refills in my organizer.
I wrote about my trip on my blog.
Literally 'online diary'. Used for personal journal-style websites.
I update my online diary every day.
Reading his travel diary made me want to go on a trip too.
A ship's log or nautical diary. Very specific to sea voyages.
The captain is obliged to keep a logbook.
手帳に会議の予定を書く。
I write the meeting schedule in my planner.
ダイアリー is sometimes used for personal journals but not for business planners. Stick to 手帳 for schedules.