Countdown to any date and time

Pick a target date and time, optionally name your event, and get a large live countdown—or days since—for screenshots and social captions. Everything stays in your browser.

Countdown Calculator is for people who want a clear timer for an upcoming event or a simple elapsed-time view after it happens. Choose a date and time in your browser’s local timezone, add an optional label, and select the units and display style that make sense for the audience. The timer updates on the device and can produce text for a caption or a clean fullscreen view. It is a presentation aid, not a source of synchronized time for legal deadlines, launches, or alarms. Handy for launches, birthdays, exam days, and travel departures when you want a large on-screen timer without an app install. Name the event, pick a timezone-aware target, and leave the page open on a display. Counts are calculated in your browser from the local clock; refresh after DST changes if the displayed remaining time looks stale. [batch-a-home-pass-2026-11-13]

Quick start

1. Enter a target date and time (defaults to your local timezone).
2. Optionally add an event label such as “Product launch”.
3. Watch the live countdown update every second in the main stage.
4. Use Options to switch between countdown and days-since, choose units, 12h/24h display, and a card theme.

When to use something else

• Event launch: Set a local launch time and show days and hours on a shared screen.
• Anniversary: Use days-since mode to display how long it has been since a date.

Limitations

• The timer uses the device clock and local timezone; it does not send alerts or guarantee clock accuracy.

FAQ

Does the countdown keep running if I close the tab?

The live display needs an open page. Closing the tab stops the on-screen timer; reopen the same event settings (or bookmark) to resume watching. The target instant itself does not change while the tab is closed.

How are time zones handled?

Pick the event timezone when you set the target so travelers and remote attendees share one wall-clock moment. After daylight-saving transitions, refresh if the remaining time looks off relative to your local clock.

Can I count up from a past date?

Yes—use count-up mode for anniversaries, incident duration, or “days since launch” displays. The same large readout works on a lobby screen or classroom projector.

Is this a calendar or reminder app?

No push notifications or accounts. It is a browser countdown/count-up for moments you already know. Pair it with your calendar app if you need alerts.

Publisher: SBFChoice. This free browser utility is maintained by the publisher. No ad units are shown in this configuration. The homepage may include Google AdSense publisher verification (ads.txt and an account script only on this page). See the Privacy Policy.