Set the alarm clock for 4:13 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 4:11 am Alarm clock for 4:12 am Alarm clock for 4:14 am Alarm clock for 4:15 am

Going to bed for a 4:13 am alarm

Asleep by 6:58 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:28 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:58 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.

4:13 am across the country

Sydney	4:13 am
Brisbane	4:13 am
Adelaide	3:43 am
Perth	2:13 am
Darwin	3:43 am

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

How to use the online alarm clock

Newborns don't care what time it is, and neither does an early shift roster. If 4:13 am is when you need to be up and moving, this page will ring at exactly 4:13 am through your browser, giving parents and shift workers one less thing to double-check before they finally shut their eyes.

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.

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 4:13 am is written 04:13, and spoken aloud it's thirteen minutes past four at night. You'll also see it written 4.13 am — a full stop instead of the colon means the same time. Whether you would say set alarm for 4:13 am or put an alarm on for 4:13 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.