Countdown Timer
Set a target date and watch the real-time countdown — perfect for events, deadlines, and holidays.
Select a target date (and optionally a specific time), then press Start. The timer counts down in real time, showing days, hours, minutes, and seconds remaining. Use the quick preset buttons to instantly set a countdown to popular holidays. When the time is up, the timer shows a completion message. Press Reset to start a new countdown.
Countdown timers are useful for project deadlines, event planning, travel departures, and personal milestones. Whether you are counting down to a product launch, a marathon race, a wedding date, or simply the end of the workday, this tool gives you a clear, live view of the time remaining.
Frequently Asked Questions
How does the countdown timer work?
Enter a future date and optional time, then click Start. The timer calculates the difference between now and your target moment and updates every second. It runs entirely in your browser — no server is involved.
Can I count down to a specific time, not just a date?
Yes. Use the time field to set a specific hour and minute for your target. For example, you can count down to midnight on New Year's Eve by setting the date to January 1 and the time to 00:00.
Does the timer keep running if I switch tabs?
The timer uses JavaScript's setInterval which continues running in the background in most browsers. However, some browsers throttle inactive tabs, so the display may update less frequently. The final time calculation is always based on the actual system clock, not tick counts.
What are the quick preset buttons?
The preset buttons (New Year, Christmas, Halloween, Valentine's Day) automatically set the target date to the next upcoming occurrence of that holiday. If the holiday has already passed this year, it sets the date to next year.
What happens when the countdown reaches zero?
When the target time is reached, the timer stops and displays a "Time is up!" message. Press Reset to clear everything and start a new countdown.
Can I count down to a past date?
No — the countdown timer only works for future dates. If you enter a date that has already passed, the timer will show "Time is up!" immediately. To calculate time elapsed since a past event, use the Date Difference Calculator instead.
Does the timer persist if I close the browser?
No — the timer does not save state between sessions. Closing or refreshing the browser tab resets the timer. To set a persistent reminder, use your device's native clock or calendar app rather than this browser-based tool.
Can I share a countdown with others?
This tool does not generate a shareable URL with a countdown embedded. To share a countdown, take a screenshot of the running timer or consider using a dedicated countdown app that supports shareable links.
How do I set a countdown to exactly midnight tonight?
Select today's date and set the time to 23:59:59, or select tomorrow's date with time 00:00:00. For a New Year countdown, use the "New Year" preset which automatically targets January 1 at midnight.
Why does the display lag slightly after switching back to this tab?
JavaScript timers are throttled by most browsers when a tab is inactive to save battery. The display may show a second or two behind. However, the value always self-corrects the moment you return to the tab — the shown time is re-derived from the actual system clock.