Set the alarm clock for 4:17 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 4:15 am Alarm clock for 4:16 am Alarm clock for 4:18 am Alarm clock for 4:19 am

Going to bed for a 4:17 am alarm

Asleep by 7:02 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:32 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:02 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.

4:17 am across the country

Sydney	4:17 am
Brisbane	4:17 am
Adelaide	3:47 am
Perth	2:17 am
Darwin	3:47 am

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

How to use the online alarm clock

Nobody sets an alarm for 4:17 am for fun. Maybe it's an early shift at the depot, a long drive before the roads get busy, or you're still awake and don't trust yourself to notice the time. Pick a sound, set it for 4:17 am, and this page will handle the rest while the house stays quiet.

Choose a sound before you press Start — something like a chime or a classic bell tends to work better than anything too gentle. Once it's running, the countdown happens right here in the browser, which means the tab needs to stay open in the background rather than being closed.

Unlike a phone alarm, this one won't ring if you close the tab, put the computer to sleep, or shut the lid, so it suits a desk, a kitchen bench, or anywhere the device stays powered on and awake. It's free to use and doesn't need an account, but it's not built for unattended overnight use. On a 24-hour clock 4:17 am is written 04:17, and spoken aloud it's seventeen minutes past four at night. Written the Australian way that's 4.17 am, and typed in a hurry it's often 4:17am. Whether you would say set alarm for 4:17 am or put an alarm on for 4:17 am, the steps are the same: pick a sound, press Start, leave the tab open.

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.