Set the alarm clock for 11:17 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 11:15 am Alarm clock for 11:16 am Alarm clock for 11:18 am Alarm clock for 11:19 am

Going to bed for a 11:17 am alarm

Asleep by 2:02 am — 6 full sleep cycles, about 9 hours
Asleep by 3:32 am — 5 full sleep cycles, about 7 hours
Asleep by 5:02 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.

11:17 am across the country

London	11:17 am
Birmingham	11:17 am
Manchester	11:17 am
Glasgow	11:17 am
Belfast	11:17 am

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

How to use the online alarm clock

Getting the railway-arch workshop ready ahead of opening gives you time to set an alarm for 11:17 am before tools, keys and shutters demand your attention. That leaves a useful stretch before 12:00 pm for checking the entrance, switching on equipment and preparing the first job without relying on a hurried glance at the clock.

Because the workshop alarm is being prepared early, test its sound now while there is still time to notice a muted browser or volume set too low. Choose the alert, set 11:17 am, and run a brief trial so you recognise what you will hear later. If the browser is no longer running when 11:17 am arrives, the workshop-opening alarm cannot sound; keep a separate alarm as backup if the phone or computer might go to sleep.

Inside a railway arch, late-morning daylight can differ sharply between the pavement, doorway and workbench. Before settling into another task, adjust the lamps or raise the shutter enough to make keys, locks and trip points clearly visible. At 11:17 am, changing the lighting in advance also helps prevent the alarm from arriving just as you are moving through a dim entrance with both hands occupied.

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 11:17 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.