Set the alarm clock for 10:20 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 10:18 am Alarm clock for 10:19 am Alarm clock for 10:21 am Alarm clock for 10:22 am

Going to bed for a 10:20 am alarm

Asleep by 1:05 am — 6 full sleep cycles, about 9 hours
Asleep by 2:35 am — 5 full sleep cycles, about 7 hours
Asleep by 4:05 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.

10:20 am across the country

Sydney	10:20 am
Brisbane	10:20 am
Adelaide	9:50 am
Perth	8:20 am
Darwin	9:50 am

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

How to use the online alarm clock

Some people set this for 10:20 am because their phone alarm gets silenced by early notifications; others just want a second, louder reminder. Either way, pick 10:20 am, choose a sound, press start, and leave the tab open. It'll ring at 10:20 am until you close it or hit stop.

Select a sound, hit Start, and that's the whole setup. The countdown runs inside this browser tab rather than on your device's operating system, so it needs to remain open, on a phone or laptop, until the alarm actually goes off.

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 10:20 am is written 10:20, and spoken aloud it's twenty past ten in the morning. You'll also see it written 10.20 am — a full stop instead of the colon means the same time. Setting the alarm to 10:20 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

Common questions

Do I need to create an account or download anything?

No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.

Can I change the alarm sound?

Yes, there's a short list of tones to choose from before you press Start. Pick whichever one you're most likely to actually hear — softer sounds are easier to sleep through than a firm chime or bell.

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.