Set the alarm clock for 10:47 am

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 10:45 am Alarm clock for 10:46 am Alarm clock for 10:48 am Alarm clock for 10:49 am

Going to bed for a 10:47 am alarm

Asleep by 1:32 am — 6 full sleep cycles, about 9 hours
Asleep by 3:02 am — 5 full sleep cycles, about 7 hours
Asleep by 4:32 am — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

10:47 am across the country

Sydney	10:47 am
Brisbane	10:47 am
Adelaide	10:17 am
Perth	8:47 am
Darwin	10:17 am

Times are worked out live in your browser, so daylight saving is already accounted for.

How to use the online alarm clock

Uni lectures, gym sessions before work, or just a second alarm because the first one never works: 10:47 am is a popular time to want a backup. This rings from your browser at 10:47 am. No app store, no sign-up, just a tab that needs to stay open until it fires.

After picking a tone, press Start and leave the page open. It doesn't need an internet connection once it's running, but it does need the tab itself to stay open, so avoid closing the browser or letting the device fall asleep before the time is reached.

This works well as a second alarm, one that isn't tangled up with phone notifications, do-not-disturb settings, or low battery. It genuinely won't ring if the tab gets closed or the device goes to sleep, so treat it as a backup or a work-desk tool rather than the only alarm for something important. On a 24-hour clock 10:47 am is written 10:47, and spoken aloud it's thirteen minutes to eleven in the morning. Timetables and rosters may show it as 10:47, and handwritten notes as 10.47 am. If you need it loud, turn the system volume up before you start: the alarm plays at whatever the device is set to.

Common questions

Is this alarm accurate across daylight saving time?

It uses your device's local clock, so as long as your computer's time and date settings are correct, it'll adjust automatically when daylight saving time starts or ends.

Can I use this on my phone instead of a laptop?

Yes, it works in a mobile browser the same way, but phones are more likely to lock the screen or sleep, which can stop the alarm from ringing. A laptop or desktop tends to be more reliable for this.

Can I set more than one alarm at a time?

This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.

Why use a browser alarm instead of my phone's built-in one?

Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.