The Journal

Chores in a shared calendar: what a recurring event cannot do

A calendar answers when. A task list answers whether. That is not a matter of taste: the standard calendar apps use to exchange data defines two different objects for the two jobs, and a household that puts its chores in the first loses what the second provides. For a family on Google there is a sharper trap, because the calendar can be shared and the task list, as Google describes it, cannot. The answer for many homes is both, wired one way.

Published 2 November 2026

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What a calendar event is, and what the standard gives a task instead

Calendar apps commonly exchange events in iCalendar, the format defined in the internet standard RFC 5545. It defines an event, called VEVENT, and a separate to-do, called VTODO, which it describes as "an action-item or assignment", for example "an item of work assigned to an individual".

The difference is written into the properties each is allowed. Three exist only on a to-do. DUE is "the date and time that a to-do is expected to be completed". COMPLETED is "the date and time that a to-do was actually completed". PERCENT-COMPLETE lets whoever has the to-do report how far through it they are. An event has none of the three.

Both can carry a STATUS, but the values differ. An event's status can be TENTATIVE, CONFIRMED or CANCELLED. A to-do's can be NEEDS-ACTION, COMPLETED, IN-PROCESS or CANCELLED. An event can be confirmed. Only a to-do can be done.

The failure mode: the recurring event nobody ticks

Put "Clean the bathroom, Saturday 10am, weekly" in a shared calendar and it will appear every Saturday whether or not anyone cleaned the bathroom last week. The calendar has no way to know. The event comes and goes, and the record of the week is the same whether the job was done or not.

The standard describes the opposite behaviour for a to-do. A VTODO with no start or due date, it says, "will be associated with each successive calendar date, until it is completed". A to-do waits for you. An event moves on without you.

That is why chores in a calendar tend to decay in a recognisable way. The reminders keep arriving, nobody can tell from the calendar which weeks were missed, and after a while the event is something everyone scrolls past. Why reminders stop working explains why a prompt that arrives at the same time every week is the kind people learn to ignore.

The Google household's trap: a shared calendar, and a task list that is not

Google makes the calendar half easy. When you create a family group on Google, "a calendar called 'Family' is automatically created" and everyone who joins can see it.

The task half does not follow. Google's help page on shared tasks names two places a shared task can be created and assigned: "A space in Google Chat" and "Google Docs for eligible Google Workspace plans". It describes no way to share a Tasks list itself between two people. So a family on Google gets a calendar everyone can see and a task list that, in practice, belongs to one person. That is exactly how chores end up in the calendar.

Apple keeps the two objects separate and shares both. Reminders lists can be shared, and a reminder assigned to someone in the list. iCloud calendars can be shared privately with people who have an Apple Account and use iCloud. Both stay inside Apple's ecosystem, which matters if anyone in the house has an Android phone.

Bounded work and unbounded work

A useful test for which tool a job belongs in: does it happen at a time, or by a time?

A dentist appointment happens at a time. If it moves, the time moves. It belongs in the calendar.

Cleaning the bathroom happens by a time. Any point on Saturday will do, and what matters is that it is done before the guests arrive. It belongs on a list, with a due date and a person.

Some jobs are both. A delivery that someone has to be in for is an appointment for whoever waits in. The rest of the household only needs to know it is happening. Put the time-bound part in the calendar and leave the rest off.

Three jobs a shared calendar genuinely does better

None of this is an argument against calendars. They are better than any list at three things.

Clashes. Two people cannot be in two places, and only a calendar shows that at a glance.

Awareness. Research on family calendars, such as Neustaedter, Brush and Greenberg's study of 44 families in 2009, describes the family calendar as a tool for "coordination and awareness": it is how a household knows what is happening, not only when. Cozi vs FamilyWall goes into that work.

Anything with other people's times in it: school terms, bin collection days, a partner's shifts. These are facts about time, and a calendar is the right place for them.

Wiring the two together without two sources of truth

Many households are best served by both: the calendar for the shape of the day, the list for the jobs. The rule that keeps it working is that each item lives in exactly one place.

If you want a job to appear in the calendar, so you can see it beside the appointments, let the task app put it there one way: tasks with due dates are shown or published into the calendar, and nothing in the calendar is ever read back into the list. Two-way sync, where either side can change the other, sounds better and goes wrong in a predictable way: a job is moved in the calendar, the list does not agree, and the household now has two answers to "when is this due?" and no way to tell which is right.

This is this journal's reasoning, not a tested result. It follows from the standard: events and to-dos have different properties, so any sync between them has to decide what to do with the properties one side does not have.

Running the experiment for a fortnight

If you are not sure which your household needs, try this for two weeks.

Move every chore out of the calendar and onto a shared list, each with a person and a day. Leave appointments where they are.

At the end of each week, look at two things: which jobs are marked done, and which appointments were missed. If the list told you something the calendar never could, which jobs actually happened, keep it. If nobody opened the list, the problem is attention, not the tool, and a calendar or a screen on the kitchen wall may serve you better.

For two adults choosing a list app, Chore apps for couples sets out four tests, and What free means in a household app lists what is free in each.

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