Daily Planner

About Daily Planner

How Time Blocking Works

Time blocking is a scheduling method where you assign each task to a specific hour of the day instead of working off a loose to-do list. Cal Newport, the Georgetown computer science professor who popularised the method in Deep Work and A World Without Email, argues that a 40-hour time-blocked week can produce the same output as a 60-hour week worked reactively. The reason is that an unblocked day leaves every hour open to whichever task shouts loudest, while a blocked day has already decided what deserves the next hour before email, Slack, or Teams get a chance to vote.

Worked example: A software engineer has a 7-hour workday, two meetings (10 AM and 3 PM), a 2-hour deep-work task (rewriting a module), four code reviews, and 20-30 Slack messages to triage. Reactive day: the engineer works through Slack messages first, gets pulled into an unplanned call, starts the deep work after lunch, gets interrupted by code reviews, and finishes the module the next morning. Blocked day: 9-11 AM deep work on the module (phone silenced), 11-11:30 code reviews, 11:30-12 Slack triage, 1-3 PM buffer/overflow, 3-4 PM meeting, 4-5 PM second code-review batch. The module ships on day one and the reviews still get done.

Approach	How It Works	Downside
To-do list only	List tasks, work through them in any order	Easy to procrastinate on hard tasks; no sense of when things happen
Time blocking	Assign each task a specific time slot on a timeline	Requires upfront planning; needs flexibility for interruptions
Hybrid (recommended)	Block major tasks, leave buffer slots for overflow and surprises	Slightly more planning effort

Event Categories

Category	Colour	Examples
Work	Blue	Deep work, project tasks, emails, admin
Personal	Green	Errands, hobbies, family time, reading
Health	Red	Exercise, meal prep, meditation, doctor appointments
Meetings	Purple	Calls, video conferences, 1-on-1s, standups

The colour coding makes it easy to see at a glance how your day is balanced. If your timeline is mostly blue, you might want to add some green or red blocks for personal and health activities.

Planner Features

Feature	What It Does
Click to add	Click any hour slot on the timeline to create an event with a title, time range, and category
Current time line	A red horizontal line marks the current time on today's view, updating every minute
Day navigation	Previous and Next buttons move between dates; each date stores its own schedule
Summary bar	Shows total tasks, blocked hours, free hours, and a category breakdown
Edit and delete	Click an existing event to modify it or remove it from the schedule
Persistent storage	All events saved to localStorage and available across browser sessions

Daily Planning Templates

Here are some common day structures that work well with time blocking:

Template	Structure	Best For
Deep work morning	6-9 AM focused work, 9-10 AM meetings, 10-12 PM work, PM admin/meetings	Knowledge workers, writers, programmers
Meeting-heavy day	Meetings clustered 9 AM - 1 PM, deep work 2-5 PM	Managers, team leads
Split day	Work 7-11 AM, personal/health 11 AM - 2 PM, work 2-6 PM	Freelancers, remote workers
Student schedule	Classes fixed, study blocks between, exercise in the evening	Students with lecture schedules
Balanced day	Equal blocks of work, personal, and health spread through the day	Anyone prioritising work-life balance

Tips for Effective Daily Planning

Tip	Why It Works
Plan the night before	Starting the day with a plan eliminates morning decision paralysis
Block your most important task first	Ensures it gets done before meetings and distractions fill the day
Leave 25% of your day unblocked	Buffer time absorbs unexpected tasks and prevents the schedule from breaking
Batch similar tasks together	Context switching costs 15-25 minutes per switch according to productivity research
Schedule breaks explicitly	If breaks are not on the schedule, they tend not to happen
Review at the end of the day	Compare planned vs actual to improve future estimates

How the Summary Bar Helps

The summary section at the top shows how many events you have, how many hours are blocked, and how much free time remains in the day. A category breakdown shows the split between work, personal, health, and meetings. This helps you spot imbalances - for example, if meetings are taking 6 hours and deep work only has 2, you might need to protect more focus time.

What Does the Research Actually Say?

Time blocking is backed by solid attention-research findings, not just productivity folklore. A few numbers worth knowing:

Finding	Number	Source
Average recovery time after an interruption	23 minutes 15 seconds	Gloria Mark, UC Irvine, "The Cost of Interrupted Work" (CHI 2008)
Average uninterrupted focus span on a screen	~47 seconds (2021), down from 2.5 minutes in 2004	Gloria Mark, Attention Span (2023)
Other tasks encountered before returning to original	2.3	Mark, Gudith, Klocke (2008)
Output uplift from a time-blocked week	Roughly +50%	Cal Newport, Deep Work (2016)
Meetings that could have been an email (US survey)	~70%	Harvard Business Review (Perlow, Hadley, Eun, 2017)

The takeaway is that unplanned context switching is expensive and invisible. You do not feel 23 minutes vanishing when you glance at Slack, but the cumulative effect on a reactive day is enormous. A time-blocked day is not about squeezing more hours out of yourself - it is about protecting the few hours you already have from being shredded by micro-interruptions.

How Long Should a Block Be?

Most people overestimate how long they can sustain genuinely focused attention. Cal Newport recommends 60-90 minute deep-work blocks as the upper end for most knowledge workers, with 2-4 hours per day being a realistic maximum before mental fatigue degrades the output. Anders Ericsson's deliberate practice research on elite performers (violinists at the Berlin Music Academy) found that even world-class practitioners capped their most demanding practice at around 4 hours across the day, split into 60-90 minute blocks with rest in between.

Task Type	Suggested Block	Notes
Deep work (writing, coding, analysis)	60-90 min	Protect with silent phone and blocked notifications
Email and Slack triage	20-30 min	Two or three batches per day, not continuous
Meetings	25 or 50 min	Default 30/60 minute slots steal 5-10 min of every hour
Administrative tasks	30 min	Good for post-lunch dip when deep work is hard
Study blocks	50 min + 10 min break	Newport's "Straight-A" recommendation for students
Buffer/overflow	60 min	Absorbs overruns; keeps schedule from collapsing

The Pomodoro timer fits naturally inside these larger blocks - you can set a 90-minute deep-work block on the planner and run three or four Pomodoro cycles inside it to keep the attention fresh.

Time Blocking vs Calendar vs To-Do App?

A common question is whether a daily planner replaces or complements existing tools. The short answer: they solve different problems.

Tool	Strength	Weakness
Shared calendar (Google, Outlook)	Coordinates meetings with other people	Invites fill slots others picked, not slots you picked
To-do app (Todoist, Things)	Captures every task so none are forgotten	Does not decide when any task actually happens
Paper planner	No notifications, feels committing to write	Not searchable, lost if misplaced
Browser time-block planner	Decides what happens in each hour, stored per-date	Not a meeting-invite system for colleagues

Most people who stick with time blocking use two tools together: a shared calendar for anything that involves other people, and a personal time-block plan for the rest of the day. The checklist maker handles the "capture everything" layer; the daily planner then decides when each captured task actually gets its hour.

Common Mistakes That Make Time Blocks Fail

• Blocking 100% of the day. A plan with no buffer breaks the first time a meeting runs long. Aim for 60-75% blocked and keep the rest open.
• Scheduling deep work after lunch. The post-lunch dip (around 1-3 PM) is well documented - blood glucose, circadian rhythm, and sleep pressure all work against focus. Put deep work in the morning or late afternoon.
• Copy-pasting yesterday's plan. Meetings shift, energy shifts, priorities shift. Plan each day the night before or first thing in the morning, not on autopilot.
• Ignoring overruns. A block that consistently overruns by 50% is not a planning failure - it is a signal that the task is larger than you think. Re-scope it or block more time.
• Forgetting to schedule breaks and meals. If it is not on the schedule it does not happen, and skipped breaks lead to evening fatigue that ruins tomorrow.
• Treating the plan as a contract. The value is in deciding in advance, not in rigid execution. A 70% adherence rate is a successful blocked day.

For simple to-do lists without time slots, the checklist maker handles task lists with checkboxes. To time individual focus sessions within your blocks, the Pomodoro timer pairs well with a daily plan. For tracking recurring daily habits over weeks, the habit tracker shows streaks and completion rates. All data stays in your browser with nothing stored on any server.

Sources

• Gloria Mark, Daniela Gudith, Ulrich Klocke - The Cost of Interrupted Work (CHI 2008, UC Irvine)
• Cal Newport - Deep Habits: Planning Every Minute of Your Work Day
• Cal Newport - On Deep Breaks and Block Length
• Harvard Business Review - Stop the Meeting Madness (Perlow, Hadley, Eun, 2017)
• Ericsson, Krampe, Tesch-Romer - The Role of Deliberate Practice (Psychological Review, 1993)
• NHS - Sleep, Tiredness and the Post-Lunch Dip