Countdown timer

A countdown shows exactly how long is left until something happens: a product launch, an exam, a flight, a holiday or the end of a sale. This tool calculates the time remaining to any target date and time and updates it live.

How to use it

1. Choose the target date and time.
2. Watch the remaining days, hours, minutes and seconds count down.
3. Keep the tab open, or come back later; the remaining time is recalculated from the clock each time.

How the time remaining is calculated

The tool takes the difference between the target timestamp and the current time in milliseconds and breaks it into units: 86,400,000 ms per day, 3,600,000 per hour, 60,000 per minute and 1,000 per second. Because it is based on the system clock rather than a counter, it stays correct even if your computer sleeps or the tab is in the background.

Example

From 27 October 2026 at 10:00 to 1 January 2027 at 00:00 local time there are 65 days and 14 hours remaining.

Things to keep in mind

• Time zones: the target is interpreted in your local time zone. If the event is in another time zone, convert it first, or people in other regions will see a different countdown.
• Daylight saving time: a countdown spanning a DST change will show one hour more or less than a naive calculation of calendar hours.
• Accuracy: the countdown depends on your device clock. Most devices sync automatically, but a wrong system clock gives a wrong countdown.