Set the alarm clock for 5:47 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 5:45 am Alarm clock for 5:46 am Alarm clock for 5:48 am Alarm clock for 5:49 am

Going to bed for a 5:47 am alarm

Asleep by 8:32 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:02 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:32 pm — 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.

5:47 am across the country

London	5:47 am
Birmingham	5:47 am
Manchester	5:47 am
Glasgow	5:47 am
Belfast	5:47 am

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

How to use the online alarm clock

Once you have moved the car out of the overnight parking zone, a 5:47 am alarm marks the moment to lock up and head back inside. That leaves the street clear before restrictions change and gets the job finished ahead of 6:00 am, without turning the final few minutes into another task.

With an alarm tied to moving the car, set the volume high enough to stand out from an extractor fan, radio or traffic outside, then test it briefly at the same level. Background noise can easily mask a browser signal, especially if the phone is left in a coat pocket. If the page is dismissed or the handset falls asleep, the alarm may never sound, and the car could remain in the overnight parking zone when you meant to leave. Keep the page active and the handset awake until the signal has done its job.

Returning indoors at 5:47 am can disturb people who are still sleeping, so silence the signal before opening the front door and avoid leaving it to repeat. Put keys and shoes somewhere easy to reach beforehand, and use vibration alongside a moderate tone if the handset will stay close. This keeps the early reminder noticeable to you while reducing the chance that it wakes the rest of the house.

Common questions

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.

What happens if my laptop goes to sleep before 5:47 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.