Set the alarm clock for 10:23 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 10:21 am Alarm clock for 10:22 am Alarm clock for 10:24 am Alarm clock for 10:25 am

Going to bed for a 10:23 am alarm

Asleep by 1:08 am — 6 full sleep cycles, about 9 hours
Asleep by 2:38 am — 5 full sleep cycles, about 7 hours
Asleep by 4:08 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.

10:23 am across the country

London	10:23 am
Birmingham	10:23 am
Manchester	10:23 am
Glasgow	10:23 am
Belfast	10:23 am

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

Online alarm clock for 10:23 am

You’re wrapping up what you are doing and getting ready to leave for your appointment at the council offices. An alarm for 10:23 am gives you a firm departure cue while there is still time to collect your documents, keys and travel card. Leaving then also gives you a useful margin before 11:00 am, rather than turning the journey into a last-minute rush.

While gathering the paperwork for your council visit, check where your phone is sending its audio. Headphones left connected in a coat pocket or bag can receive the alarm without you noticing it across the room. Play a brief test sound, disconnect them if necessary, and choose a volume you can hear while moving about. Keep the alarm page active and your phone awake; otherwise the alert may be silenced and your council appointment could be missed.

After setting off for the council offices this morning, protect a little space before the next commitment in your day. Allow for a delayed bus, a queue at reception or a few minutes spent finding the correct desk. If the appointment finishes early, that spare time can become a calm pause for checking where you need to go next instead of forcing two morning tasks together.

Common questions

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.

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.