Countdown Page Generator — Set a Title & Date, Share by URL
Create a countdown page for a product launch, event, deadline, or anything else by setting a title and target date. Everything is stored in the page URL — no account and no server-side storage — so sharing the link shows the same countdown to whoever opens it.
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The target date is set relative to your own timezone. Anyone you share this with will see the same moment, converted to their local time.
How to use
- Enter a title (optional) and a target date & time, then click "Create countdown".
- The page switches to a live view showing the time remaining (or elapsed, if the date has passed).
- Copy the share URL shown on the page and send it anywhere — anyone who opens it sees the same countdown.
How it works
How URL sharing works
Your title and target date are never saved to a server or database. Instead, they're stored directly in the page's URL as query parameters. When you copy and share the URL, whoever opens it gets the same title and target date recalculated live, entirely in their own browser.
About timezones
The target date is stored as an absolute moment in time, based on your own timezone at the moment you create it. That means if someone opens your link from a different timezone, they'll see the same underlying moment — just displayed converted to their own local time (for example, setting "December 31, midnight" in Japan time will show as the equivalent local time for someone overseas).
How the remaining/elapsed time is calculated
The number of milliseconds until the target date is broken down into days, hours, minutes, and seconds through simple division. If the target date has already passed, the same breakdown is applied to the elapsed time instead, and the display switches accordingly. No special handling is needed for leap years or leap seconds, since the calculation works purely off the millisecond difference.
Not just for birthdays
This tool is a general-purpose countdown generator for product launches, events, deadlines, or anything else — it isn't limited to birthdays. It doesn't include birthday-specific features like automatic age calculation from a birth date.
FAQ
Is my title or date sent anywhere?
No. Everything you enter is stored in the page's URL, and the countdown is calculated entirely in your browser. Nothing is saved to a server or database.
Will people I share the link with see the same time?
Yes. The target date is stored as an absolute moment in time, so anyone opening the link from a different timezone will see that same moment, converted to their own local time.
Can I use this for a birthday countdown?
You can, but this tool is a general-purpose countdown generator rather than a birthday-specific one — for example, it doesn't include automatic age calculation from a birth date.
Can I edit a countdown after creating it?
Yes. From the countdown view, use the "Edit" button to change the title or date and generate a new URL. This doesn't overwrite the original link, so if you already shared it, you'll need to share the new URL.
What happens if I open the page after the target date has passed?
The display switches to show how much time has elapsed since the target date. It won't show an error.
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