How to use the online alarm clock
Hand the last task to your colleague, then set the alarm for 10:42 pm so you can leave in time for the last suburban train. That gives you a clear stopping point before 11:00 pm, instead of letting the handover stretch while the platform clock keeps moving. Keep your coat, ticket and keys together so the alarm means ‘go’, not ‘start searching’.
Once your colleague has the details, leave this alarm page open while you finish the handover. It may continue running when the page sits behind another app or browser tab, but background restrictions can prevent the sound from reaching you reliably. Closing the page or allowing the phone to sleep means the alarm cannot ring, which could make you miss the train. Keep the screen awake, turn the sound up, and check that silent mode will not suppress the alert.
After a warm evening, the air outside can feel noticeably different from an air-conditioned office or station. Before leaving for the train, step away from the strongest cooling for a few minutes and take a light layer for the platform or carriage. At 10:42 pm, indoor air conditioning may still be brisk even if the evening outside remains mild, so something easy to remove is more practical than dressing for only one temperature.
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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