Set the alarm clock for 7:25 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 7:23 am Alarm clock for 7:24 am Alarm clock for 7:26 am Alarm clock for 7:27 am

Going to bed for a 7:25 am alarm

Asleep by 10:10 pm — 6 full sleep cycles, about 9 hours
Asleep by 11:40 pm — 5 full sleep cycles, about 7 hours
Asleep by 1:10 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.

7:25 am across the country

London	7:25 am
Birmingham	7:25 am
Manchester	7:25 am
Glasgow	7:25 am
Belfast	7:25 am

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

How to use the online alarm clock

While you wait for the right moment to leave for a rock-pool hunt, set the alarm for 7:25 am and keep an eye on the remaining preparations rather than repeatedly checking the clock. That leaves a useful stretch before 8:00 am for gathering water shoes, a towel and the tide information you already have. Keep the browser active and your phone awake; otherwise the alarm for your rock-pool hunt will remain silent.

Your chosen sound should suit the place where you are waiting. A gentle tone works when the room is quiet and you are already watching the time, while a more persistent sound makes sense if packing or conversation may distract you. Check the volume before settling down, then leave the alarm visible so its status is easy to confirm. The aim is a clear cue to head out, without startling everyone else nearby at 7:25 am.

Before leaving in the early morning, notice the change between an air-conditioned room and the warmer air outside. Put shoes and any light outer layer near the exit, where they will not be chilled by the airflow, and carry water for the walk. Moving away from strong air conditioning a few minutes before departure can make the transition feel less abrupt as the day begins to heat up.

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 7:25 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.