How to use the online alarm clock
Halfway through supervising lunch duty in the school canteen, you need a clear signal that it is 2:37 pm and time to step away from the tables. There are 23 minutes before 3:00 pm, enough to finish the current sweep of the room, pass any notes to the next member of staff and leave without repeatedly checking the clock.
Canteen noise can make a visual alert easy to miss, yet your phone’s silent setting may prevent the alarm from being heard. Check the sound level before returning to lunch duty, then keep the alarm visible so you can confirm it is running. Closing this page or allowing the phone to sleep means no sound will interrupt your canteen duty, so use the school’s usual backup arrangement if the handover cannot be late.
Moving from a warm dining area into an air-conditioned corridor can make this midday handover feel surprisingly abrupt. Keep a light layer nearby rather than leaving it in another part of the school, and place your phone where cool air from a vent will not be your only reminder to move. At 2:37 pm, that small preparation helps you finish the canteen task and head into the cooler space at 3:00 pm without lingering to gather belongings.
Common questions
What happens if my laptop goes to sleep before 2:37 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.
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.
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