Set the alarm clock for 9:23 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 9:21 am Alarm clock for 9:22 am Alarm clock for 9:24 am Alarm clock for 9:25 am

Going to bed for a 9:23 am alarm

Asleep by 12:08 am — 6 full sleep cycles, about 9 hours
Asleep by 1:38 am — 5 full sleep cycles, about 7 hours
Asleep by 3:08 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.

9:23 am across the country

London	9:23 am
Birmingham	9:23 am
Manchester	9:23 am
Glasgow	9:23 am
Belfast	9:23 am

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

How to use the online alarm clock

As you finish what you are doing and get ready to leave for the school governors’ meeting, a 9:23 am alarm gives the departure a firm edge. It is late enough to complete a final note or put things away, yet still leaves 37 minutes before 10:00 am for the journey, signing in and finding the right room without treating the round hour as the departure time.

Because the governors’ meeting depends on hearing this particular alert, check the signal while there is still time to correct anything. Set 9:23 am, start the alarm, then play a brief test with the same volume and sound settings you intend to use. A closed browser page or a sleeping phone or laptop cannot sound the alarm, which could leave the meeting starting while you are still at home. Keep the page running and the device awake until the alert has played.

Leaving for a school meeting at this point in the morning can feel different depending on the air outside. High humidity may make a mild temperature feel close and uncomfortable, while a fresher breeze can make the walk seem cooler than the reading suggests. A light layer that is easy to remove suits the change between outdoor air, public transport and a heated school building, and a compact umbrella is sensible when the morning feels damp.

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 9:23 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.