TimerPlanCountdown timer
Countdown timer
0:00
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One thing a month worth timing
MonthlyOne thing a month worth measuring or capping with a clock — a payroll trap, a nap length, a meeting that never gets added up. Two sentences and the tool.
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How is a countdown different from a timer?
The TimerPlan countdown timer counts to a moment on the clock — 3:00 pm, 17:30, half past six — while a timer counts a length from whenever you press start. The difference only shows itself when you set it early: a twenty-minute timer started at nine is finished at twenty past nine, but a countdown to three o’clock is still correct whether you set it at breakfast or at ten to three.
A time that has already gone today counts to tomorrow rather than turning negative, which is the behaviour an alarm needs and the one most pages get wrong.
Underneath it is the same engine as every other countdown here: the finish is stored as a real clock time, the alarm is booked into the audio clock the moment you press start, and the screen is held awake while it runs. The remaining time also sits in the tab title, so the tab need not be the one you are looking at.
Type the time the way you say it. All of these are understood:
| What you type | What it means | Ends |
|---|---|---|
3pm | Three in the afternoon | Today, or tomorrow if it has passed |
15:30 | Half past three, 24-hour | Today, or tomorrow if it has passed |
12:00 am | Midnight — the start of the day | Tonight |
12:00 pm | Noon | Today, or tomorrow if it has passed |
0645 | Quarter to seven in the morning | Tomorrow, if set in the afternoon |
The two rows in the middle are the ones worth reading twice. Twelve o’clock is the only hour where AM and PM behave the opposite way to instinct: 12:00 AM starts the day and 12:00 PM is the middle of it. The military time converter has the same trap written out in full, which is one reason 24-hour notation exists.
For a length rather than a moment, the online timer is the tool — and if it is a length you use often, the timer by duration pages open ready to run. For several things at once, each with its own name and alarm, use the kitchen timer. To count up from now instead, that is the stopwatch, and to work out how long there is between two clock times without any counting at all, use the time duration calculator.
Frequently asked questions
What happens if the time I enter has already passed today?
It counts to that time tomorrow. Entering 8:00 am at nine in the morning gives you twenty-three hours, not minus one, because a countdown to a time that has gone is nearly always a countdown to the next time it comes round. If you want the gap between two times that have both passed, that is arithmetic rather than a countdown — the time duration calculator gives it directly.
Will it still be right if I leave the tab open all day?
Yes, and this is the case a countdown is built for. The target is a real clock time, so the page can be frozen, throttled or ignored for six hours and still be exact when you look at it: it subtracts rather than accumulates. A laptop that sleeps and wakes is the same story — the sum is done against the clock, which kept running.
Does it handle a countdown that crosses midnight?
It does, without a setting. A countdown started at eleven at night to 1:00 am counts two hours and ends on the following date; the page has no notion of a day boundary because it works in absolute instants. The one thing it will not do is count more than twenty-four hours ahead — for that, a countdown to a date is a different tool and belongs on a date countdown site rather than here.
Can I share a countdown so other people see the same target?
Yes. The time you set is written into the address bar, so copying the link and sending it gives whoever opens it a countdown to the same clock time. Note that it is the same clock time, not the same instant: a colleague in another zone will count to three o’clock where they are. If the point is a meeting, convert it first with the time zone converter and send each person their own local target.
Why does it ask about notifications only after I press start?
Because that is the first moment the permission is worth anything, and asking on arrival is the fastest way to be refused forever. A prompt that appears before you have used the page gets dismissed out of habit, and a dismissed notification permission is remembered by the browser for that site — so asking early does not just fail once, it fails permanently.
How this works
Sources:
Where a countdown beats a timer
Anything scheduled. A call at three, a train at 17:42, the end of a parking session — set it once, ignore it, and the number stays true no matter when you look.
Anything shared. A link carries the target time, so a room full of people can watch the same countdown without anyone starting it at the same moment.
Not for dates. Counting the days to a birthday or a holiday is a different job with different edge cases — leap years, whole-day boundaries — and it deserves a tool built for it rather than a countdown stretched past its purpose.