Set the alarm clock for 8:36 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 8:34 am Alarm clock for 8:35 am Alarm clock for 8:37 am Alarm clock for 8:38 am

Going to bed for a 8:36 am alarm

Asleep by 11:21 pm — 6 full sleep cycles, about 9 hours
Asleep by 12:51 am — 5 full sleep cycles, about 7 hours
Asleep by 2:21 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.

8:36 am across the country

London	8:36 am
Birmingham	8:36 am
Manchester	8:36 am
Glasgow	8:36 am
Belfast	8:36 am

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

How to use the online alarm clock

Ahead of Saturday’s parkrun, preparing the finish tokens at 8:36 am leaves room to check the sequence before anyone needs them. The alarm can mark the moment to begin laying them out, with 24 minutes available before 9:00 am for counting, sorting and putting aside any that need attention. That advance cue keeps the job separate from the busier preparations nearer the start.

Because the finish-token task depends on hearing the cue, the browser needs to remain open after the alarm is set. If it is closed, or the phone or computer goes to sleep, the alarm will not sound and the tokens may still be packed away when they should be laid out. Keeping the alarm page visible and the sound turned up makes it easier to notice at 8:36 am; a separate phone alarm is sensible if the browser cannot stay active.

Travelling to a Saturday morning parkrun can take longer than the quiet-looking roads suggest, especially near a popular park where entrances, crossings and parking spaces become busy. Working backwards from 8:36 am should include the full journey, a short walk from the car park or bus stop, and enough time to reach the finish area without rushing. Checking the route beforehand also helps account for weekend diversions or a less familiar gate.

Common questions

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 8:36 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.

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.