Set the alarm clock for 3:12 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 3:10 am Alarm clock for 3:11 am Alarm clock for 3:13 am Alarm clock for 3:14 am

Going to bed for a 3:12 am alarm

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

3:12 am across the country

Sydney	3:12 am
Brisbane	3:12 am
Adelaide	2:42 am
Perth	1:12 am
Darwin	2:42 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 3:12 am. This alarm rings straight from your browser tab at 3:12 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.

Some people use this alongside a phone alarm rather than instead of it: a louder backup through laptop speakers, or a way to set a reminder without touching a phone at all. It won't survive the tab closing or the device sleeping, so for anything critical overnight, keep a second alarm running as well. On a 24-hour clock 3:12 am is written 03:12, and spoken aloud it's twelve minutes past three at night. You'll also see it written 3.12 am — a full stop instead of the colon means the same time. 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

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.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.