Set the alarm clock for 9:39 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 9:37 am Alarm clock for 9:38 am Alarm clock for 9:40 am Alarm clock for 9:41 am

Going to bed for a 9:39 am alarm

Asleep by 12:24 am — 6 full sleep cycles, about 9 hours
Asleep by 1:54 am — 5 full sleep cycles, about 7 hours
Asleep by 3:24 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.

9:39 am across the country

London	9:39 am
Birmingham	9:39 am
Manchester	9:39 am
Glasgow	9:39 am
Belfast	9:39 am

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

How to use the online alarm clock

You are finishing the last few jobs before leaving for a circular walk on a public footpath, so set the alarm for 9:39 am while boots, keys and a light layer are still in reach. That gives the morning a clear departure point without waiting until 10:00 am and letting another task delay the start.

While you gather your things, this alarm page may sit behind a map, weather forecast or message. A background tab can be slowed or silenced by browser settings, so leave this page open, keep its sound permitted and check that the volume is audible before stepping away. If the browser is closed or the computer goes to sleep, the alarm cannot signal the start of your walk; use a separate phone alarm if you need a reminder after leaving the screen.

For a 9:39 am departure, think about how exposed the route will feel later rather than judging the air beside an open window or indoor air conditioning. On a warm British morning, take water, choose a shaded section where possible and carry a layer that can be removed easily. Starting before 10:00 am may keep more of the circular route in the cooler part of the day, especially if there is little shelter along the public footpath.

Common questions

Can I use this on a phone?

It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.

Does the alarm still work if I close the tab?

No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.

What happens if my laptop goes to sleep before 9:39 am?

The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.