Count Up Timer
Start counting from now or any past moment and see how much time has passed in days, hours, minutes, and seconds. Quick start presets, fullscreen projection, shareable links, and automatic restore after refresh. Runs entirely on your device, no sign-up needed.
No start time set yet
Add a start time parameter (ts) to the link to begin counting
Start time：
Double-click the timer area to quickly enter or exit fullscreen
How to use
- Enter an event name (optional), pick the start moment (defaults to now), and choose the timezone that moment belongs to
- Or tap a quick preset such as "Today midnight", "This Monday", or "1st of this month", or enter a number with a unit (sec/min/hour/day/week) to start from a past moment
- Click "Set start" to see the elapsed days, hours, minutes, and seconds in real time; the browser tab title keeps counting too, even when the tab is in the background
- Use "Fullscreen" for projection, "Copy share link" to send the same start moment and timezone to friends; settings are saved locally and restored after refresh
Features
Popular use cases
Enter the moment you got together or married, and check "days together" or "years married" anytime; turn on "count the first day" to match anniversary conventions.
Keep the date a loved one passed; the first-week and yearly milestones appear on their own as the numbers tick quietly on.
Days since you joined, since you moved on, or since a team or project began — mark the timeline of your career.
Planks, focused study, stream uptime, meeting duration — count from the very first second, with big fullscreen digits.
Live examples (real embeds, not screenshots)
The timers below are rendered live by this tool's own embed page, growing every second. Hit "Open" to launch the full tool with the same settings — set your own start moment, pick colors, and click "Copy embed code" to put the same widget on your blog, profile, or live stream.
Moments in history: how long has it been?
From wars and disasters to milestones in science and history — open any moment to see a live count-up, or switch the start to a date of your own.
What is a count up timer?
A count up timer accumulates time forward from a start moment, expressing how much has passed in days, hours, minutes, and seconds. Opposite to a countdown, which ticks toward a future target, a count up has no endpoint — the numbers only grow. It is widely used for workouts, focused study, live streams, meeting timing, and project tracking — anywhere that only cares about "since when". Most "count the days" moments in life fall into this category: days together, years married, a memorial anniversary, days since you joined or left a company, or how long a company has existed. Even a website's launch day is just one start date away from an answer.
Is the count up accurate?
This tool computes the difference between your device's system clock and the start moment's absolute timestamp, refreshing the display every second. As long as your device time is correct, the count up is accurate. Even if you refresh the page, close the browser, or shut down the computer, reopening it continues from the same start — the timer runs on "now minus start", so whether the page stays open makes no difference. An incorrect device clock would, of course, skew the result.
What is the difference between counting up and counting down?
Both rely on your system clock but run in opposite directions: a countdown ticks from now toward a future target, answering "how much time is left" — numbers shrink and an alert fires at zero, ideal for fixed deadlines; a count up accumulates from a start moment, answering "how long has passed" — numbers grow with no endpoint, ideal for measuring or displaying an ongoing duration. Use a countdown when there is a deadline, and a count up when there is only a starting line.
How is "days elapsed" calculated?
The day count is derived from the total elapsed time, rounded down: now minus the start gives the seconds passed, and every full 24 hours counts as one day, with the remainder shown as hours, minutes, and seconds. So from today midnight to 8 p.m. it shows 0 days 20 hours — meaning less than a full day. Likewise, "1 day 3 hours" means exactly 27 hours, regardless of how many calendar dates fall in between. This keeps the elapsed time identical for anyone who opens the same share link, in any timezone. Many anniversaries instead count the start day itself as day 1 (starting Oct 1, Oct 4 is day 4) — turn on "Count the first day as day 1" to add one to the day count while hours, minutes, and seconds stay real; the Together, Married, and In-memory scenes enable it automatically.
Does daylight saving time affect the count up?
No. The count up runs on the absolute timestamp of the start moment, independent of how any local clock is adjusted. When DST starts or ends, the local wall clock jumps by an hour, but the physical instant you started from does not change, and the elapsed time keeps growing smoothly with no sudden one-hour jump. The wall-clock label of the start may look an hour off after the switch (because the local clock changed), yet the timing itself stays precise.
Frequently asked questions
Yes. The timer is calculated as "current system time minus the absolute start moment", not by accumulating seconds, so refreshing the page, closing the browser, or even shutting down the device and reopening later continues from the same start — the elapsed time does not depend on how long the page was closed. This assumes your device clock is accurate; computers and phones normally sync it automatically.
Yes. The share link carries both the absolute start moment and your chosen timezone, so friends open it counting from the same start with perfectly synced numbers. They can still switch the timezone on the page to see the start in their local wall-clock time; the start moment itself never changes.
Yes. By default counting starts the moment you open the page, but you can set the start to any past moment: tap "Today midnight", "This Monday", "1st of this month", "Jan 1 this year", or enter a number with a unit (e.g. 30 minutes ago), and the page shows how long has passed since then.
By default each full 24 hours counts as one day. If you prefer counting the start day itself as day 1 (starting Oct 1, Oct 4 is day 4), turn on "Count the first day as day 1" — one is added to the day count while hours, minutes, and seconds stay based on real elapsed time. The Together, Married, and In-memory scene chips enable this convention automatically, and it is saved with share links and embed snippets too.
No. All settings are stored only in your own browser (localStorage) and in the link parameters, and every calculation runs locally — nothing passes through a server. Clearing browser data removes the local save, but the share link still works.
Yes. "Screen Fullscreen" fills the entire monitor with no browser chrome, and "Web Fullscreen" fills the browser window; the numbers scale up automatically. Press ESC or the close button to exit. Great for gyms, live streams, meeting rooms, and events.
No — a count up has no endpoint and no sound alert; its purpose is to show "how long has passed". If you need a timer that alerts you when a moment arrives, the companion countdown timer is the better fit.
Yes. Click "Copy embed code", choose a rectangle (420×200), square (360×360), or banner (728×150) size, and paste the generated iframe snippet into your blog, stream announcement, or web page. The embedded version supports fullscreen and custom colors, and never reads or writes the visitor's browser local storage.
No installation required. The count up runs directly in your browser and works on Windows, macOS, phones, and tablets, with a layout that adapts to any screen. Your settings are stored locally in the current browser and restored automatically after closing the page or even shutting down the device.
Related tools
Working with time? These tools pair well with the count up:
The perfect counterpart: count down toward a future target with an alert at zero, ideal for fixed deadlines.
A fullscreen clock with retro flip animation, great for desks, live streams, and meeting rooms.
Convert between Unix timestamps and date-times with automatic second/milli/micro/nanosecond precision detection and multi-timezone views.