How to use the online alarm clock
While you wait for the appointed check, keep an eye on the clock and use the 7:40 pm alarm as the moment to review the overnight engineering works schedule for the Underground. That leaves a clear window before 8:00 pm to confirm the affected lines, note any replacement transport and pass the practical details to anyone who needs them.
Your engineering check can easily be missed if the alarm sound has quietly switched to connected headphones. Before relying on it, play a brief test and look at the browser’s audio destination, especially if wireless headphones were used earlier. Set a volume that will be noticeable without being disruptive. Keep the alarm page running and the computer awake until it sounds; otherwise, the reminder cannot prompt that final schedule review.
Once the overnight works information is recorded, consider the conditions outside before any evening journey or site visit. At 7:40 pm, check the local humidity alongside the temperature rather than judging the air from indoors. Damp, close air may make a light outer layer feel unnecessary, while a cooler breeze can change that quickly. Pack a layer that is easy to carry, and allow a moment at the door to adjust it before setting off.
Common questions
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.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
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.
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