How to use the online alarm clock
As you finish your shift and leave the 24-hour supermarket at 4:17 am, set this alarm for the moment you need to clock out, collect your things or catch the night bus home. There are 43 minutes until 5:00 am, enough time to complete the final handover without repeatedly checking the clock.
Your supermarket shift may end quietly, but the alarm still depends on the sound settings already chosen on your phone or computer. Check the volume before returning it to your pocket, especially if silent mode has been used on the shop floor. The browser must remain active and the equipment running; otherwise, the supermarket alarm will not sound when you are ready to leave. A brief test alert can confirm that it is audible above nearby tills and refrigeration units.
Leaving a supermarket during the night means the familiar background noise changes quickly: humming chillers and cleaning machines give way to a much quieter car park or street. At 4:17 am, listen for the alarm indoors rather than assuming you will notice it once outside. If you are waiting near a staff entrance, keep the volume high enough to stand out from delivery vehicles arriving before dawn, while avoiding headphones that could mask announcements from colleagues.
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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