Set the alarm clock for 5:31 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 5:29 am Alarm clock for 5:30 am Alarm clock for 5:32 am Alarm clock for 5:33 am

Going to bed for a 5:31 am alarm

Asleep by 8:16 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:46 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:16 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.

5:31 am across the country

Sydney	5:31 am
Brisbane	5:31 am
Adelaide	5:01 am
Perth	3:31 am
Darwin	5:01 am

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

Online alarm clock for 5:31 am

You are wrapping up and heading out to deliver the replacement logbooks to the captain of the first Manly ferry. Setting the alarm for 5:31 am gives you a clear leaving time while the house and streets are still quiet. It also leaves a useful stretch before 6:00 am for collecting the journals, checking you have the right set and reaching the wharf without turning the departure into a last-minute scramble.

Your 5:31 am alarm needs more than the time entered correctly: it also depends on the browser remaining open and the phone or computer staying awake. If either closes down too soon, the alarm may stay silent and the ferry logbooks could miss their planned handover. Keep the page active, leave the device connected to power if needed and set the volume high enough to hear from where you are finishing your preparations.

Because you are leaving early while other people in the house may still be asleep, place the device close to you rather than across the room. Choose a clear but moderate sound, prepare your keys and journals beforehand, and stop the alarm promptly at 5:31 am. A vibration setting can add a nearby cue without making the whole household share your ferry run.

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.