How to use the online alarm clock
While you watch the clock for the end of your overnight supermarket shift, set the alarm for 1:43 am so the agreed finishing moment does not slip past during a quiet spell. With 2:00 am only 17 minutes later, it also leaves a clear boundary between the last routine jobs and anything that should be handed over to the next colleague.
Your supermarket shift may end unnoticed if the browser alarm loses its active connection or the phone goes to sleep, so keep the page running and the screen awake until 1:43 am. Check the device’s silent setting as well: some browsers can still play audio, while others follow the handset’s muted output. A quick sound check at a low volume lets you confirm what will happen without disturbing shoppers or colleagues nearby.
Leaving a brightly lit supermarket at 1:43 am can make the outside air feel unexpectedly damp, particularly after rain or beneath low cloud. Keep a light outer layer somewhere accessible rather than packed at the bottom of a bag, and allow a moment for misted glasses or a damp windscreen to clear before setting off. The air may also feel cooler on an exposed walk to a bus stop or staff car park than it did by the shop entrance.
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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