Set the alarm clock for 5:10 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 5:08 am Alarm clock for 5:09 am Alarm clock for 5:11 am Alarm clock for 5:12 am

Going to bed for a 5:10 am alarm

Asleep by 7:55 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:25 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:55 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.

5:10 am across the country

Sydney	5:10 am
Brisbane	5:10 am
Adelaide	4:40 am
Perth	3:10 am
Darwin	4:40 am

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

How to use the online alarm clock

An alarm at 5:10 am in the dead of night usually means a red-eye flight, a delivery run, or a newborn's next feed. This sets a browser alarm for 5:10 am that rings through your laptop speakers, so you don't need to fumble for your phone in the dark. Leave the tab open and it'll do the waking for you.

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.

A browser alarm like this one is handy when your phone's on silent, charging in another room, or you just don't want to unlock it and get pulled into notifications. The trade-off is honesty: it only rings while this tab stays open, so it's not a replacement for your phone alarm on a trip where the laptop lid might close. On a 24-hour clock 5:10 am is written 05:10, and spoken aloud it's ten past five in the morning. Written the Australian way that's 5.10 am, and typed in a hurry it's often 5:10am. Set an alarm for 5:10 am, set the alarm to 5:10 am, set my alarm for 5:10 am — all of it lands on this page and does the same thing.

Common questions

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.

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.