Set the alarm clock for 7:47 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 7:45 am Alarm clock for 7:46 am Alarm clock for 7:48 am Alarm clock for 7:49 am

Going to bed for a 7:47 am alarm

Asleep by 10:32 pm — 6 full sleep cycles, about 9 hours
Asleep by 12:02 am — 5 full sleep cycles, about 7 hours
Asleep by 1:32 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.

7:47 am across the country

London	7:47 am
Birmingham	7:47 am
Manchester	7:47 am
Glasgow	7:47 am
Belfast	7:47 am

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

Online alarm clock for 7:47 am

You are already halfway through another job when you need to break away and open the canal gate for the first boat. Set the alarm for 7:47 am so the sound marks the moment to stop what you are doing, collect anything you need and head to the lock. That leaves the gate operation clear of the changeover at 8:00 am rather than relying on a hurried glance at the clock.

While you continue with the job in hand, this alarm page can sit behind another browser tab and keep counting towards 7:47 am. Check that your sound is audible before switching away, and keep the browser session running. Closing the browser or allowing your phone or laptop to sleep means the alarm cannot alert you to open the canal gate for the boat, so use a separate alarm if you cannot leave everything active.

Before stepping away for the early canal opening, keep food and drink simple enough to finish without delaying your departure. A mug of tea or water can fit beside the remaining task, while a full cooked breakfast is easier to leave until the first boat has passed and the gate is secure. Put the cup somewhere stable and away from papers or controls, so the 7:47 am alert leads to a clean pause rather than a spill and another distraction.

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 7:47 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.