By Manuj Mehta · Updated
To write a diary, put the date at the top, then write what happened, how you felt about it and anything you want to remember — in your own voice, as if you're talking to a friend. A diary entry can be one line or a full page. The only rule is honesty; nobody else needs to read it.
Diary vs journal: is there a difference?
The words are mostly interchangeable. Traditionally, a diary is a dated, day-by-day record of events, while a journalis broader — it can hold reflections, ideas, plans and prompts with no fixed schedule. In practice, most people's diaries include feelings and most journals include dates. Call it whichever makes you want to write.
A simple diary entry format
- Date (and time). It's what makes a diary useful years later.
- Greeting (optional). “Dear Diary” or nothing at all — some people find addressing someone makes writing easier.
- What happened. The main events, people and places of the day.
- How you felt. Your reactions, worries, highs and lows.
- What you're thinking about next. Plans, questions, things to follow up.
You don't need all five every day. On a busy day, a date and one line is a complete entry.
Diary entry examples
A short entry
12 Nov, 9:40pm — Long day. Presentation went better than I feared. Need to thank Arjun for the slides tomorrow.
A reflective entry
Sunday. Spent the morning at Mum's. She told the story about the train to Shimla again and I realised I'd never written it down. Writing it here so I don't lose it. Feeling calmer than I have all week — I think it's because I didn't check work email once.
A “nothing happened” entry
Quiet day. Rain. Finished the book. Mood: 6/10, a bit restless. Want to plan something for next weekend.
What to write in a diary when nothing happened
- One thing you noticed today that you'd usually ignore.
- What you ate, listened to, read or watched — and whether you liked it.
- A conversation, even a small one, and how it made you feel.
- What's worrying you, and what's the smallest step to deal with it.
- Something you're looking forward to.
- Your mood as a number from 1 to 10, and one word for why.
How to keep writing a diary every day
Diaries are abandoned when they feel like homework. Make the minimum tiny — one line — and keep the diary where you already are, which for most people is their phone. A home-screen widget that opens straight to today's page removes the last bit of friction.
It also helps to keep separate diaries for separate parts of life — work, family, health, travel — so each one stays focused and easy to reread. In Penso Notes each diary can have its own theme and its own lock.
Keeping your diary private
Privacy is what lets you write honestly. On paper that means a hiding place; on a phone it means a diary with its own PIN, entries stored on your device rather than someone else's cloud, and backups that go only to your own account. Our private diary guide covers what to look for.
Frequently asked questions
How do you start a diary entry?
Start with the date, then either "Dear Diary" or simply the first thing on your mind. Many people begin with one sentence about how the day went and let the rest follow.
How long should a diary entry be?
There is no minimum. A single line counts as an entry. Most daily entries are a few sentences; longer entries tend to happen on days with big events or strong feelings.
What is the format of diary writing?
A common diary format is: date and time, an optional greeting, what happened, how you felt about it, and what you're thinking about next. It is written in the first person, in your own informal voice.
Is it better to keep a diary on paper or on a phone?
Paper is good for slow, reflective writing; a phone diary is better for consistency because it's always with you, searchable, and can be locked and backed up. Many people use both.