Countdown Calculator
How long until your event? Enter a date and time and watch the countdown in days, hours, minutes, and seconds. It uses your local time unless you choose another time zone.
Time remaining
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hours
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Enter a valid date and time.
This moment has already passed.
- Total days
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- Total hours
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- Total minutes
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Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
The calculator turns the date and time you enter into an exact moment, using the time zone you choose (your own by default). Every second it takes the difference between that moment and the current time on your device, and splits it into days, hours, minutes, and seconds. Once the moment has passed, it keeps counting the time that has gone by since then. The countdown runs in your browser and nothing you enter is sent anywhere.
The formula
Time left = moment of the event − current time
The result is split like this: days = total seconds ÷ 86,400, then the remainder into hours, minutes, and seconds.
Worked example
It is December 1 at 12:00 and you want to know how long until December 25 at 00:00.
- From December 1 at 12:00 to December 25 at 12:00 there are 24 days.
- The event is 12 hours earlier than that, so it is 23 days and 12 hours away.
- In total that is 564 hours, or 33,840 minutes.
Frequently asked questions
How many days are left until a date?
Enter the date and time of the event and the calculator counts down to it live, in days, hours, minutes, and seconds, plus the totals. It uses the clock of your device, so the countdown is right for where you are.
Does the countdown use my local time?
Yes, by default. A date and time like "January 1 at 00:00" means your own local midnight. If the event happens in another place, such as a game or a launch in a different country, choose that time zone and the countdown will end at the right moment.
What happens when the time reaches zero?
The countdown stops at zero and then starts counting how much time has passed since the event, with a message that the moment has already passed.
Does it count the days when the clocks change for daylight saving time?
Yes. The countdown is based on the real moment of the event, so a day with 23 or 25 hours is counted correctly.