⏰ Online Alarm Clock
Multi-function time management tool — World Clock, Real-time Clock, Alarm, Stopwatch, Countdown Timer. All browser-based.
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📖 How to Use
- Clock — Real-time display with 4 themes, 12/24h toggle and fullscreen mode
- Alarm — Set time-based reminders with custom labels, flexible repeat modes (Once/Weekdays/Daily/Custom), snooze and notification
- World Clock — Track time across multiple cities with day/night indicators and search to add more cities
- Stopwatch — 0.01s precision timer with start/pause, lap and reset
- Countdown — Custom h/m/s input with 6 presets, circular progress bar and sound notification
- All settings saved in browser localStorage. Alarms require the tab to remain open.
⚠️ Alarms require the browser tab to remain open. For important reminders, consider setting device-native alarms as backup.
What is this tool
A clock toolkit: live clock, world clock, stopwatch, countdown and alarm, with fullscreen mode.
How to use
- 1. Pick clock, stopwatch, countdown or alarm
- 2. Set timezone or target time
- 3. Go fullscreen if needed
Example
World clock → Beijing, London and New York at once
FAQ
Will the alarm ring if I close the tab?
No, alarms need the page running.
Which timezones are supported?
All IANA timezones, selectable by city.