How long until your event? Set a target date and watch it tick down, live. Runs in your browser.
How the countdown timer works
The countdown takes a target date and time and computes the live difference between now and that moment, refreshing every second to show days, hours, minutes and seconds remaining. It reads the current time from your device, so it stays accurate as long as your clock is set correctly. If the target is already in the past, it flips to show how long ago the event happened instead of a negative number.
Common uses
- Events — count down to a wedding, concert, launch or holiday.
- Deadlines — watch a project or assignment due date approach.
- Travel — track time until a flight or trip begins.
- Personal goals — mark days until a birthday or anniversary.
Frequently asked questions
Does it account for my time zone?
Yes. The target you enter is interpreted in your device’s local time zone, and the ticking uses your local clock.
What happens after the date passes?
The timer switches to counting up, showing how much time has elapsed since the event.
Will it keep running if I leave the page?
It recalculates from the current time whenever the page is open, so reopening it simply shows the correct remaining time.
Can I share the same countdown with someone else?
Because it uses each viewer’s local clock, two people in different time zones will see the moment arrive at their own local equivalent unless you specify a shared zone.
Is the countdown precise to the second?
It updates once per second using your device clock, which is accurate for everyday planning. For events where every second counts, double-check against an official time source.
Can I set a countdown for a specific time, not just a date?
Yes. Include the hour and minute when you pick the target, and the timer counts down to that exact moment rather than to midnight of the day.
Counting down across time zones
A moment in time is a single instant, but the clock you read it off is not. “The launch is at 9am” means two different instants in Tokyo and in Toronto, and a countdown that treats the number as an absolute will be wrong for one of them. This timer reads the target you enter in your device’s own time zone and compares it against your device’s clock, so the moment arrives when it arrives where you are.
That is the right behaviour for personal use and the wrong behaviour for coordination. If you are counting down to a livestream you intend to watch, the timer being local is exactly what you want. If you are telling a distributed team that a deadline is in three hours, everyone’s timer should agree on the same instant regardless of where they sit — and that needs an explicitly stated zone, not a bare clock time.
The practical fix is to convert the target into a zone everyone shares before you announce it. The time zone converter does that conversion in both directions, so you can agree on the instant once and let each person’s local tool display it correctly.
Why a countdown can disagree with a clock
Two countdowns aimed at the same moment, side by side, will occasionally differ by a second. That is normal and it comes from the fact that each one is reading a different device clock, not from an error in the arithmetic.
- Clock drift. Device clocks are disciplined by network time, but the correction is periodic. A phone that has been asleep for a day can be a second or two off until it next syncs.
- Time zones and daylight saving. A target entered before a DST transition and read after it can appear an hour out if the target was stored as a wall-clock time rather than an instant. Storing the instant avoids this entirely.
- Leap seconds. These are absorbed by clock synchronisation rather than counted by ordinary timers, so a countdown spanning one will not show it.
- Tab throttling. Browsers slow timers in background tabs to save power. A countdown recomputed from the current time rather than incremented per tick stays correct regardless, which is why this one recalculates.
Making a deadline that people meet
A countdown is a useful tool and a poor substitute for a clear deadline. The failures are predictable: the date is stated without a zone, or with a zone and without a year, or on a day that a region treats as a public holiday. None of those are timer problems, and none of them are fixed by a more precise timer.
State the instant, the zone and the format. “Friday 17:00 UTC” removes every ambiguity that “end of Friday” leaves open. If you are setting a deadline for a team that spans regions, rotate the meeting time rather than accommodating one zone permanently — a recurring 9am that suits one office is a 10pm that quietly excludes another.
For personal deadlines, the countdown is most useful set at a granularity you can act on. A timer showing 43 days is motivation; the same timer showing 3,715,200 seconds is noise. Set the target, then check it weekly rather than watching it.
The same interval expressed four ways
| Unit | What it counts | Useful when |
|---|---|---|
| Days | Full 24-hour periods | Long-range planning |
| Hours | Total hours remaining | Shift handovers, sprints |
| Minutes | Total minutes | Meeting timing, cooking |
| Seconds | Total seconds | Deadline precision |
| Weeks | Seven-day blocks | Rough planning |