Set the alarm clock for 10:39 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 10:37 am Alarm clock for 10:38 am Alarm clock for 10:40 am Alarm clock for 10:41 am

Going to bed for a 10:39 am alarm

Asleep by 1:24 am — 6 full sleep cycles, about 9 hours
Asleep by 2:54 am — 5 full sleep cycles, about 7 hours
Asleep by 4:24 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.

10:39 am across the country

Sydney	10:39 am
Brisbane	10:39 am
Adelaide	10:09 am
Perth	8:39 am
Darwin	10:09 am

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

Online alarm clock for 10:39 am

While handing the Perth call to the next person, set the alarm for 10:39 am and pass along the notes they will need. The reminder leaves a useful checkpoint before 11:00 am, while the people in Perth are still easing into their early morning. A clear handover now means the replacement knows who is joining, what has already been discussed and what needs an answer.

Because this reminder belongs to the handover, leave the alarm page running where the replacement can see and hear it. If the tab or browser is closed, or the computer goes to sleep, the Perth call alert will not sound; the person taking over could then miss the cue. Keeping the page active avoids relying on a browser alarm that is no longer able to run. The displayed time also gives both people a quick way to confirm that 10:39 am was entered correctly.

A late-morning changeover can put the screen in stronger daylight than it had earlier. Before stepping away, angle the monitor away from window glare and adjust the room light so the alarm time remains easy to read. If sunlight is moving across the desk, a blind lowered partway can keep the display visible without making the workspace gloomy. That small preparation helps the next person notice the visual alert as well as hear 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.