How to use the online alarm clock
As you hand your remaining work to a colleague, set the 3:33 pm alarm so you can leave for your NHS blood donation without carrying unfinished tasks with you. That gives the handover a clear stopping point while keeping your departure visible. With 27 minutes until 4:00 pm, there is time to explain what still needs attention, gather your appointment details and put on anything needed for the journey.
Because the alarm is meant to mark your departure, check that the phone or computer will stay active until it sounds. Keep this page open and prevent the device from going to sleep; otherwise the alarm may stay silent and your NHS blood donation journey could begin late. Set the volume before returning to the handover, then leave the screen where you can notice the alert even if the room becomes busy.
Your route may take longer in the afternoon as school traffic and the early build-up towards the evening commute reach local roads. Check the journey time soon after setting the alarm, allowing for the walk from parking or public transport to the donation venue. If traffic is already slowing near 3:33 pm, finish the handover a few minutes ahead of the alert so it remains a departure cue rather than the moment you start packing.
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 3:33 pm?
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.
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