Set the alarm clock for 11:59 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 11:57 am Alarm clock for 11:58 am

Going to bed for a 11:59 am alarm

Asleep by 2:44 am — 6 full sleep cycles, about 9 hours
Asleep by 4:14 am — 5 full sleep cycles, about 7 hours
Asleep by 5:44 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.

11:59 am across the country

London	11:59 am
Birmingham	11:59 am
Manchester	11:59 am
Glasgow	11:59 am
Belfast	11:59 am

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

How to use the online alarm clock

Pause what you are doing when the 11:59 am alarm sounds, then gather your things and begin the circular walk on the public footpath. That gives you a clear break from the task already occupying you, with 12:00 pm marking the start of the route rather than another moment spent finishing small jobs.

Before leaving for the circular walk, set the alarm and keep the sound level high enough to hear from across the room. Keep this page visible and your phone awake until 11:59 am; otherwise the alarm cannot sound, and your public-footpath walk may start late. Connecting the phone to power can also prevent an aggressive battery-saving setting from putting it to sleep before the alert.

Once the alarm pulls you away, allow for the journey to the trail as well as the walk itself. Roads near town centres and popular beauty spots can become busier around midday, while a rural lane or National Trust car park may take longer to reach than the mileage suggests. Check the route before 11:59 am and leave keys, boots and a waterproof together so the morning departure is not delayed.

Common questions

Can I change the sound?

Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.

Will it still be right when the clocks change?

Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.

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.