Set a browser alarm for a local time of your choice, with an optional label.
Calculations happen locally. We do not send your values to our server.
Setting 07:00 at 22:30 rings tomorrow morning, 8 h 30 min later, while setting 07:00 at 06:59 rings in 1 min. Setting it at exactly the current minute waits until the same time tomorrow, 24 h away.
The chosen hour and minute are turned into the next matching local date and time, and a browser timer compares that moment with the device clock until it is reached. The status line confirms the exact date and time scheduled, and Cancel alarm clears it.
The alarm runs inside the web page, so it only works while the tab is open, the browser is running and the device is awake. A sleeping laptop, a suspended phone tab, battery saving or muted audio will all stop it from sounding.
Choose an alarm time, add an optional label and press Set alarm. The tool schedules the next occurrence of that local time: setting 07:00 at 22:30 rings tomorrow morning, 8 hours 30 minutes later, while setting 07:00 at 06:59 rings in one minute. If you set it at exactly the current minute, it waits for the same time tomorrow, 24 hours later. The status line confirms the exact date and time scheduled, and Cancel alarm clears it.
This alarm runs inside the web page. It only works while the tab remains open, the browser is running and the device is awake. Laptops that sleep when the lid closes, phones that suspend background tabs, battery-saving modes and muted audio can all prevent the alarm from sounding. Keep the device plugged in, set it not to sleep, keep the tab visible and check the volume before relying on it, or use your phone’s built-in alarm for important wake-ups.
A browser alarm works well on a desk computer for reminders during the day, such as leaving for a meeting at 13:15 when it is 09:00, which is 4 hours 15 minutes ahead. The alarm follows your device clock and time zone. It does not repeat daily or snooze. For a fixed duration, such as 20 minutes of reading, the Online Timer is simpler, and for counting down to a date weeks away, use the Countdown tool, which shows days as well as hours.
| Input | Result |
|---|---|
set 07:00 at 22:30 | rings tomorrow 07:00 · 8 h 30 min |
set 07:00 at 06:59 | rings today 07:00 · 1 min |
set 07:00 at 07:00 | rings tomorrow 07:00 · 24 h |
set 13:15 at 09:00 | rings today 13:15 · 4 h 15 min |
No. Closing the page ends the alarm, because everything happens in the tab rather than on a server. Keep the device plugged in, set it not to sleep, keep the tab visible and check the volume before relying on it, or use your phone’s built-in alarm for important wake-ups.
It is scheduled for that time on the following local calendar day. That is why setting 07:00 at 22:30 rings the next morning, and why an alarm set at exactly the current minute waits a full day instead of firing immediately.
No, it rings once for the next occurrence and does not repeat or snooze. It works well on a desk computer for reminders during the day, such as leaving for a meeting at 13:15 when it is 09:00, which is 4 h 15 min ahead. For a fixed duration use the Online Timer, and for a date weeks away use the Countdown.