Server Time Checker — Website Server Clock
See a website's real server clock and how far off your own clock is
Checked through our server
Updated 2026-10-05Why server time matters
Ticket sales and course registrations open on the website’s server clock, not yours. If your clock is a second or two behind, you click late. This tool reads the site’s server time and shows how far your clock is off.
How to use
- Tap a preset (Ticketmaster, Live Nation, AXS, Eventbrite or Universe) to check it right away, or type any website address and press Check.
- The server clock starts ticking, along with how far ahead or behind your own clock is.
- Press Alarm under the clock. The alarm time is set to the next full hour on the server clock; change the hours, minutes or seconds if the sale opens at another time. A time that has already passed today means tomorrow.
- Turn the 10 min / 3 min / 1 min before and On time alerts on or off. All four start on. Each lead alert plays three short beeps and the target plays one long beep, while the clock flashes for a few seconds. Untick “Play a sound” for a silent, visual-only alarm.
- Check again a few minutes before opening for the best accuracy. The alarm stays set and follows the newly measured difference.
How it is measured
- We read the target’s HTTP
Dateheader three times and use the median. - Round trips between our server and the target, and between your browser and our server, are both corrected for.
- The Date header has one-second resolution, so accuracy is roughly ±0.5 seconds.
- Alarm times and the countdown use the server clock: your clock plus the measured difference. Beeps are scheduled on the Web Audio clock and re-synced every 30 seconds, which keeps them on time in most background tabs. The flash appears as soon as the tab is visible; alerts noticed more than a minute late are skipped instead of shown as if on time.
- While the alarm waits, supported browsers are asked to keep the screen on. Alarm settings are not saved, so turn the alarm on again after reloading.
- Large sites answer from many servers or a CDN, so results can vary slightly between checks. The exact opening moment is up to each site, so also check the announced on-sale time.
FAQ
How do you get a website's server time?
Web servers include their current time in the Date header of every response. Our server requests the site, reads that header and corrects for network delay.
How accurate is it?
The Date header has one-second resolution, so expect roughly ±0.5 seconds. Milliseconds shown are an estimate.
Why does this tool use a server?
Browser security rules (CORS) block web pages from reading another site's Date header, so this one tool has to check through our server.
How does the alarm work?
After a check, press Alarm under the clock. The alarm time starts at the next full hour on the site's server clock and you can edit it. Pick any of 10 min before, 3 min before, 1 min before and On time; at each one you hear beeps and the clock flashes for a few seconds.
Will the alarm go off in a background tab?
The beeps are queued on the browser's audio clock, so they usually play on time while this tab stays open. Browsers slow down timers in background tabs, though, so the flash may only show when you come back, and nothing plays if the tab is closed or the computer sleeps. Keep the tab in front just before the sale.
Why is there no sound?
Browsers block audio until you interact with the page. Turning the alarm on counts as that interaction; if a notice says the sound was blocked, tap the page once. Also check that your device is not muted.
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