Set the alarm clock for 11:52 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 11:50 am Alarm clock for 11:51 am Alarm clock for 11:53 am Alarm clock for 11:54 am

Going to bed for a 11:52 am alarm

Asleep by 2:37 am — 6 full sleep cycles, about 9 hours
Asleep by 4:07 am — 5 full sleep cycles, about 7 hours
Asleep by 5:37 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.

11:52 am across the country

London	11:52 am
Birmingham	11:52 am
Manchester	11:52 am
Glasgow	11:52 am
Belfast	11:52 am

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

How to use the online alarm clock

You have only just woken up, and returning your books to the mobile library is still an intention rather than a journey. An alarm for 11:52 am gives you a clear point to get dressed, collect every borrowed book and check where the van is stopping today. With 12:00 pm close behind, there is little room for searching under the sofa once the alarm sounds.

Your headphones deserve a quick check before you rely on this alarm. Audio can be routed to them without an obvious sign, leaving the room quiet while they sit in a pocket or another room. Disconnect them, or test the alarm volume, before settling back for a few minutes. Because this browser alarm cannot alert you after its page is closed or your phone falls asleep, the mobile-library books could miss their return slot; keep the page visible and the phone awake until 11:52 am.

A late-morning walk to the mobile library may feel different from the view through the window. In humid air, a light layer can become uncomfortable quickly, while a dry breeze may make shade feel cooler than expected. Check the local conditions before leaving, choose something easy to carry, and protect the books in a bag if damp air or a shower is likely.

Common questions

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.

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.