Set the alarm clock for 10:03 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 10:01 am Alarm clock for 10:02 am Alarm clock for 10:04 am Alarm clock for 10:05 am

Going to bed for a 10:03 am alarm

Asleep by 12:48 am — 6 full sleep cycles, about 9 hours
Asleep by 2:18 am — 5 full sleep cycles, about 7 hours
Asleep by 3:48 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.

10:03 am across the country

Sydney	10:03 am
Brisbane	10:03 am
Adelaide	9:33 am
Perth	8:03 am
Darwin	9:33 am

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

How to use the online alarm clock

Getting out the door for the school run or the commute into the city gets easier when 10:03 am is locked in properly. Choose a sound, hit start, and this browser alarm will ring at 10:03 am whether you're upstairs making lunches or still half asleep. Just keep the tab open so it has a chance to go off.

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.

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 10:03 am is written 10:03, and spoken aloud it's three minutes past ten in the morning. Timetables and rosters may show it as 10:03, and handwritten notes as 10.03 am. Set an alarm for 10:03 am, set the alarm to 10:03 am, set my alarm for 10:03 am — all of it lands on this page and does the same thing.

Common questions

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.

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.