Set the alarm clock for 11:39 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 11:37 am Alarm clock for 11:38 am Alarm clock for 11:40 am Alarm clock for 11:41 am

Going to bed for a 11:39 am alarm

Asleep by 2:24 am — 6 full sleep cycles, about 9 hours
Asleep by 3:54 am — 5 full sleep cycles, about 7 hours
Asleep by 5:24 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.

11:39 am across the country

Sydney	11:39 am
Brisbane	11:39 am
Adelaide	11:09 am
Perth	9:39 am
Darwin	11:09 am

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

How to use the online alarm clock

Midday shifts, split rosters, and long lunch breaks all make 11:39 am a useful checkpoint. Choose a sound, set this for 11:39 am, and leave the tab open. It'll ring right through your laptop speakers whether you're at a desk or on the couch during a break.

Pick whichever sound you're most likely to actually notice, then press Start. The alarm is tied to this browser tab, so it needs to stay open. Minimising the window is fine, but closing the tab or the browser will stop the countdown before it ever rings.

It's free to use, doesn't need an account, and works the same in any modern browser, but it's honestly not meant to replace your phone for anything you can't afford to sleep through. Keep the tab open and the device awake, and it'll ring reliably at the time you set. On a 24-hour clock 11:39 am is written 11:39, and spoken aloud it's twenty-one minutes to twelve in the afternoon. Timetables and rosters may show it as 11:39, and handwritten notes as 11.39 am. Set an alarm for 11:39 am, set the alarm to 11:39 am, set my alarm for 11:39 am — all of it lands on this page and does the same thing.

Common questions

Can I set more than one alarm at a time?

This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.

Why use a browser alarm instead of my phone's built-in one?

Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

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.