Set the alarm clock for 5:09 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 5:07 am Alarm clock for 5:08 am Alarm clock for 5:10 am Alarm clock for 5:11 am

Going to bed for a 5:09 am alarm

Asleep by 7:54 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:24 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:54 pm — 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.

5:09 am across the country

London	5:09 am
Birmingham	5:09 am
Manchester	5:09 am
Glasgow	5:09 am
Belfast	5:09 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 preparing the flowers for Columbia Road Market, set the alarm for 5:09 am before packing away your scissors and heading out. That gives you a clear stopping point when the last stems, buckets and wrapping still need attention. With the alarm handling the time, you can leave knowing what was completed rather than repeatedly checking the clock as 6:00 am approaches.

Before relying on the signal for your departure, run a brief test at the same volume and with the same browser settings you intend to use. A sound that seems obvious in a quiet room may be lost beside rustling paper, running water or movement near the door. The alarm cannot sound after its browser page is closed or the phone falls asleep, which could leave the flowers waiting when you meant to set off. Keep the page active and the phone awake until the signal plays.

Leaving with market flowers this early can mean moving between a cool workroom and a warmer van or street. If air conditioning is running, keep wrapped stems away from its direct draught while you make the final trip outside. At 5:09 am, outdoor heat may still be lower than later in the day, so loading promptly can reduce the sudden temperature change before the journey to Columbia Road.

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 5:09 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.