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Install it on your phone

This is a website, but you can install it like a normal app. On Android, an "Install app" button appears in the header: it puts an icon on your home screen, and from then on the app opens full screen, without the browser's bars around it.

On iPhone and iPad, Apple doesn't allow that button, so you do it from Safari: tap Share and choose "Add to Home Screen". The same header button shows those two steps if you forget them.

There's a practical reason to install it, not just convenience: on iOS, reminders only work once the app is on the Home Screen. Either way, reminders appear on your device while the app is open or was used recently; nothing is sent from a server, so your tasks never leave the phone.

• Open this page?
• Go to the home pagegthenh
• Go to the Meeting Plannergthenm
• Go to the Agendagthena
• Go to the Life Clockgthenl
• Go to the World Clockgthenw
• Go to the Timezone Convertergthenc
• Go to the Jet Lag Calculatorgthenj
• Go to the Cultural Etiquette guidegthene
• Go to the Holiday Calendargthenk

Add everyone who needs to attend, wherever they are, and the planner scores every half hour of the day for the whole group at once. It checks more than who is awake: it takes into account that 14:30 is lunchtime in Madrid, that Friday is part of the weekend in Riyadh, and that a time that looked perfect falls on a public holiday in São Paulo. Every candidate time comes with its Harmony Score and, more usefully, with the reason it lost points.

Attendees can be added by country, city or time zone, and each one has their own working hours, meal times, sleep hours and weekend, all editable: the national average is a starting point, not a description of your colleague. Personal absences and public holidays are counted person by person, on each person's own local date rather than yours.

Once a time is chosen, the meeting can be exported as a calendar file, a Google Calendar link or a plain-text invitation, or turned into a poll that your attendees vote on by link. None of this needs an account: the whole plan is encoded in the page's address, so whoever opens your link sees exactly what you see.

A task manager built into a calendar that also includes other countries' days off: it shows the public holidays of your own country and of the countries you work with, records your holidays and absences, and a repeating task can be set to skip any date that is a day off — a public holiday in the countries you choose, or one of your own absences.

Plan the day, the week, the month or the whole year in visible blocks of time. Tasks have categories and subcategories, colour, tags, Markdown notes and subtasks, and the same plan can be viewed as a day column, a week grid, a month overview or a year-long Gantt chart: the view changes, the plan stays the same.

A floating pomodoro timer is attached to the task you are working on, so the focus time is recorded against that task rather than a generic countdown. Everything is stored in your browser; signing in is optional and only adds syncing between devices. Any part of the plan can be exported as a calendar file.

Enter your birth date, sex and country and it counts down the time the WHO life tables estimate you have left: years, days, hours, minutes and seconds, live. The point is not precision (it is a statistical average over millions of people) but the order of magnitude, which almost nobody estimates correctly.

Next to the countdown it shows the share of your life still ahead, roughly how many of those years are expected to be healthy ones (the WHO's HALE figure), and the days you have already lived. If you are past your country's average, the clock counts the extra time instead of stopping at zero: an average was never a date for any one person.

"Shared time" applies the same calculation to the people in your life: enter someone's age and how often you actually see each other, and it tells you how many more times that is likely to happen. A chart of who people spend their hours with over a lifetime explains why the number is much smaller than you expect. Everything stays in this browser; nothing you enter about those people is sent anywhere.

Add the cities where your colleagues, clients or family are and see the time in all of them at once. Each card shows the local time, the date when it differs from yours, and what that hour means there: whether people are asleep, having lunch or already on their weekend. That is what tells you whether it is a good moment to call.

Nothing to install and no account needed: the cities you choose and how you arrange them are saved in your browser and encoded in the page's link, so you can send someone exactly the layout you built. There are eight clock styles, from plain digits to an analogue dial, and the cards can be dragged into any order.

When the question is no longer "what time is it there" but "when should we meet", the Meeting Planner scores every half hour of the day for everyone involved, including meals, sleep, local weekends and public holidays.

Choose two time zones, a date and a time and read them side by side, with the whole day laid out hour by hour so you can see where the overlap is without doing the arithmetic yourself. Daylight-saving changes are applied by date, so a conversion for next March is correct for next March, not for today.

Below the conversion, a comparison table shows what each hour means in each place (working day, meals, sleep), so that "three in the afternoon your time" comes with the information that it is dinner time at the other end. The data is the same for every country, whether its working culture is familiar to you or not.

The result is encoded in the page's address, so a converted time can be sent to someone and opened exactly as you left it. There are also ready-made pages for the most common pairs of cities, and a link to the Meeting Planner for when more than two people are involved.

Enter where you are flying from, where to and when you land, and it estimates how long adaptation will take and gives you a day-by-day plan to shorten it. The key factor is light: when to seek it and when to avoid it. Light is what most influences the body clock, and most travel advice gets it backwards for eastward flights.

The plan covers the days before departure as well as the days after arrival, because starting before the trip shortens the adaptation. Each day states what to do and why, in plain language, with sleep and meal times alongside the light schedule.

The plan can be exported to your calendar so the reminders arrive when they are needed. And if you are flying for a meeting, the Meeting Planner can take your adaptation into account instead of assuming you will be at your best the morning you land.

How time is understood in each country: how punctual "on time" really is, how meetings open and close, how directly people say no, when it is normal to call, and which hours are simply not working hours. Fifty-four countries, several of them split by region where a single national answer would be wrong.

Each entry gives the working day, the meal times, the weekend, the expected dress code and a few specific tips. The sources are published references, not clichés, and where the evidence is thin the entry says so instead of stating it as fact.

The same data is used for the Meeting Planner's scoring, so what you read here is what the planner uses when it marks a time slot down. From any country's page you can add it straight to a meeting and see the effect.

Look up the public holidays of any country, and of the regions within it where the calendar differs: a day off in Catalonia or Bavaria is not a day off nationwide, and scheduling as if it were is a common way to end up with half the attendees missing. You can compare several countries side by side.

Holidays are grouped by type (public, bank, school, religious and observances), so you can keep the ones that stop work and set aside the ones that don't. Each entry shows the local date and, where relevant, the region it applies to.

The same holiday data is used by the Meeting Planner, where a date that is a day off for any participant loses points before you propose it, based on that person's local date rather than yours.

An .ics file is the format every calendar understands. Use it to send someone an event they can add in one click, or to put a country's public holidays into your own calendar so you can see when the people you work with are off.

Times are written the way each case needs: an all-day event as a date with no hour, a timed event anchored to the zone you choose, and, if you ask for it, a floating hour that means the same number on everyone's clock.

Your data

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