Set the alarm clock for 4:12 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 4:10 am Alarm clock for 4:11 am Alarm clock for 4:13 am Alarm clock for 4:14 am

Going to bed for a 4:12 am alarm

Asleep by 6:57 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:27 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:57 pm — 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.

4:12 am across the country

Sydney	4:12 am
Brisbane	4:12 am
Adelaide	3:42 am
Perth	2:12 am
Darwin	3:42 am

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

How to use the online alarm clock

Tradies, nurses on night shift, and anyone driving to the airport before the birds wake up all end up here around 4:12 am. This alarm rings straight from your browser tab at 4:12 am, loud enough to cut through a quiet house, without needing an app or an account first.

Using it is simple: pick a ringtone from the list, press Start, and leave this tab open in your browser. The alarm runs entirely on this page, so closing the browser will stop it from going off. Come back a minute early if you're not sure you trust it yet.

Because this runs in the browser rather than on the phone's operating system, it sidesteps silent mode and do-not-disturb entirely, useful if your phone alarm has ever failed to go off for exactly that reason. Just be aware it needs the tab open and the screen or laptop lid to stay on to actually ring. On a 24-hour clock 4:12 am is written 04:12, and spoken aloud it's twelve minutes past four at night. Written the Australian way that's 4.12 am, and typed in a hurry it's often 4:12am. Whether you would say set alarm for 4:12 am or put an alarm on for 4:12 am, the steps are the same: pick a sound, press Start, leave the tab open.

Common questions

What happens once the alarm goes off?

It rings through your device's speakers on a loop until you stop it from this page. There's no separate app notification, so make sure your volume is turned up before you rely on it.

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.