Online calendar

How it works

The grid is the civil calendar: seven weekdays, months of 28 to 31 days, leap day in February when the year is a leap year. An online calendar does not invent a 32nd of March. It displays the same squares a wall calendar would, then lets you put events on those squares and open them from another device.

Each event needs a date, a clock time if it is not an all-day mark, and a time zone if the people in the event do not share a city. Midnight in one zone is still the previous evening in another. The tool that forgets the zone will show the right clock time in the wrong place. Name the zone when the meeting is not in one room.

Repeating events are rules, not copies you paste by hand. “Every Monday at 9:00” is a weekly rule. “On the 15th of each month” is a monthly rule, and it will skip months that you did not include, not months that lack a 15th — every month has a 15th. “On the 31st of each month” is the awkward rule: months without a 31st cannot hold it. A good planner says what it does on those shorter months, instead of failing silently.

Put the event on the date it actually happens, not on the day you remembered it. Give timed events a zone if anyone is outside your city. Use all-day for birthdays and due dates that should not look like a 9 a.m. meeting.

Give repeating rules an end date when the class or the lease ends. Look at week view for work, month view for the shape of a season. Paper still works. The online part is that the grid is stored once and drawn many times. A phone, a laptop, and a shared link can show the same Tuesday. If they disagree, someone is looking at a different calendar, a different zone, or an event that was never saved.

Calendar online, same squares, different door

Calendar online is the same object reached through a web address. You log in, you see your months, you leave. Nothing about “online” changes how many days June contains. What it changes is that the grid can follow you, and that another person can be given a view or an edit right without photocopying the fridge planner.

Sharing is a permission, not a vibe. View-only means they can read Tuesday. Edit means they can move Tuesday. A public link means anyone with the address can read it, which is the wrong tool for a private medical appointment. Choose the smallest permission that does the job.

Search is the feature paper never had. Type a name, find the day. That only works if the event was titled in words you will still recognise in three months. “Stuff” on a Thursday is not a plan. “Dentist, Oak Street” is a plan. The online calendar is only as sharp as the labels you put on the squares.

If it lives only in your head, Tuesday cannot carry it. If it lives on the grid, Tuesday can, even when you forget the hour until the reminder does not.

Online calendar tool and planner

An online calendar tool is the software: the grid, the add button, the reminder, the share link. An online calendar planner is the same software used as a planning habit: look at next week before next week starts, park the deadlines on their dates, leave travel time as a block, not as optimism in the margin.

Reminders are not the event. A reminder at 8:00 a.m. for a 10:00 a.m. train is a nudge. The event is the 10:00 a.m. train. Set both. A planner that only pings and never shows the week will train you to swat notifications instead of seeing the shape of the days.

Colour layers are filters: work, home, school. Overlap them for a Tuesday that has all three. The dates underneath stay the same. When clocks change for daylight saving, timed events stored with a zone keep the same instant; the wall-clock display can jump. All-day events stay on the civil date. Store a local 9 a.m. start as local time in that zone, not as a frozen hour you will misread in March or November.