Set an alarm in your browser

Count down to the next occurrence of a selected local clock time while the browser page remains active.

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ToolAlarm Clock
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Choose a local time. Keep this tab open.

How it works

The HH:MM target becomes today’s occurrence when still ahead and tomorrow’s occurrence otherwise. An absolute timestamp drives the live countdown, while a user gesture creates browser audio and snooze replaces the target with five minutes from the click.

Formula
minutes until target = positive modulo of target minutes − current minutes over 1,440
  • Matching the current minute means the following day instead of firing immediately.
  • Five minutes is the fixed snooze interval.

Worked example

Alarm from 22:30 to 07:00
Input
											Alarm time: 07:00
Current time: 22:30
Output
												8 hours 30 minutes

When to use this

Browser tabs provide same-day reminders, study sessions set stop times, and presentation computers use a short snooze after a chime.

Edge cases

  • Closing or suspending the tab prevents the page from acting like an operating-system alarm.
  • A daylight-saving change can alter the relationship between elapsed duration and local wall-clock labels.
  • Muted output, browser policy, system sleep, or a changed audio device can suppress or delay the chime.

References