Set the alarm clock for 10:12 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 10:10 am Alarm clock for 10:11 am Alarm clock for 10:13 am Alarm clock for 10:14 am

Going to bed for a 10:12 am alarm

Asleep by 12:57 am — 6 full sleep cycles, about 9 hours
Asleep by 2:27 am — 5 full sleep cycles, about 7 hours
Asleep by 3:57 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.

10:12 am across the country

London	10:12 am
Birmingham	10:12 am
Manchester	10:12 am
Glasgow	10:12 am
Belfast	10:12 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 and set the alarm for 10:12 am, so you can break away in time to leave for your shift at the Oxfam charity shop. A departure alarm is useful when sorting laundry, making tea or finishing another job has absorbed your attention. It also leaves 48 minutes before 11:00 am, giving you a clear boundary without repeatedly checking the clock.

Your Oxfam shift is a poor moment to discover that the alert is too quiet, so test the signal now, while you can still change the volume. Choose the intended sound, set the alarm briefly, and listen from wherever you are likely to be occupied. Keep the browser active and the computer or phone awake: if it stops running, the Oxfam shift reminder cannot sound, which could leave you working past the time you meant to depart.

Leaving for a charity-shop shift during the late morning can feel different once you step outdoors, particularly on a damp British day. Check the humidity or simply look outside before 10:12 am, then allow a moment for a coat if the air feels clammy. If the room has become stuffy while you were busy, opening a window briefly can make the change to outdoor air less abrupt before you set off.

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 10:12 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.