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.

How to use the online alarm clock

As you hand responsibility for the council visit to someone else, an alarm at 10:23 am gives the handover a firm moment rather than a vague reminder. Confirm who has the paperwork, reference number and route to the municipal offices before you step away. That still leaves the appointment well separated from 11:00 am, without treating the round hour as the actual deadline.

The handover itself should shape the alarm tone. A softer sound suits a quiet office where the other person is already watching the time; a more persistent signal makes sense if they may be packing documents or moving between rooms. Set the alarm for 10:23 am, choose a tone that fits that setting and check that its volume is audible. If the browser page is closed or the device falls asleep, the alarm cannot sound, so the council appointment may be missed.

Anyone leaving for the appointment during a British morning may find the outdoor air damper than it felt indoors, even when rain is not obvious. A light layer that is easy to carry can help with the change between a warm building and humid air outside. Allow a moment before departure to check whether papers need a folder, since moisture and a hurried walk are an awkward combination.

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.