Set the alarm clock for 10:04 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 10:04 am alarm

  • Asleep by 12:49 am — 6 full sleep cycles, about 9 hours
  • Asleep by 2:19 am — 5 full sleep cycles, about 7 hours
  • Asleep by 3:49 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.

10:04 am across the country

London10:04 am
Birmingham10:04 am
Manchester10:04 am
Glasgow10:04 am
Belfast10:04 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 your current job to someone else and get ready to join the volunteer beach clean-up, set the alarm for 10:04 am. That gives the next person a clear changeover point while keeping your departure tied to a specific moment. With 11:00 am still ahead, there is time to reach the meeting area, collect a litter picker and find your assigned stretch of shore.

Your beach-cleaning kit may already include earphones for the journey, so check where the alarm audio will emerge before relying on it. A phone can quietly route the sound through connected headphones left in a pocket or bag, making the alert easy to miss amid conversation and seafront noise. The beach clean-up alarm will not sound if the browser has stopped running or the phone is asleep, so use the handset’s built-in alarm as a backup when punctual arrival matters.

Before leaving the volunteer handover, allow for the damp air often felt beside the British coast during the morning. At 10:04 am, a light layer that copes with moisture is more useful than bulky clothing once lifting, walking and collecting rubbish begin. Keep dry gloves or a spare pair in your bag, especially if wet sand, seaweed or drizzle could make the first pair uncomfortable.

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 10:04 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.