Set the alarm clock for 11:54 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 11:52 am Alarm clock for 11:53 am Alarm clock for 11:55 am Alarm clock for 11:56 am

Going to bed for a 11:54 am alarm

Asleep by 2:39 am — 6 full sleep cycles, about 9 hours
Asleep by 4:09 am — 5 full sleep cycles, about 7 hours
Asleep by 5:39 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.

11:54 am across the country

London	11:54 am
Birmingham	11:54 am
Manchester	11:54 am
Glasgow	11:54 am
Belfast	11:54 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 at 11:54 am and set this alarm for the moment you need to leave for the children’s group at the library. With 12:00 pm approaching, the alert can mark a clear stopping point, so the task in front of you does not quietly run into the time reserved for coats, bags and getting everyone out of the door.

Before returning to your current task, check where the alarm sound will play. Headphones can remain connected after music or a video has stopped, sending the alert somewhere you may not notice. Disconnect them or test the volume through the speaker you expect to hear. Keep the browser alarm running and the phone awake; otherwise it cannot remind you about the library group when departure time arrives.

For a late-morning library session, work backwards from the actual journey rather than treating noon as the leaving time. Allow for walking to the bus stop, finding a parking space, fastening a child into the car or waiting at a crossing near the high street. At 11:54 am, daytime traffic and a busy library entrance may make a short route less predictable, so let the alarm cover the journey as well as the final scramble indoors.

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.