How to use the online alarm clock
Finishing up and heading out, you can set the alarm for 9:36 pm as a final prompt to check the timetable for overnight engineering work on the Underground. That leaves a useful window before 10:00 pm to confirm which lines, stations or replacement buses may affect tomorrow’s journey, then close the task instead of carrying it into the rest of the evening.
Your engineering timetable check depends on the alarm being able to run at the chosen moment. Keep this page open and the computer or phone awake until 9:36 pm, with the volume set high enough to hear. If the page has been closed or the machine has fallen asleep, the alarm will not sound for that timetable check, so use a built-in phone alarm when you expect to leave the browser behind.
Once the overnight works have been checked, keep the remaining evening buffer visible rather than filling it automatically. At 9:36 pm, the 24 minutes before 10:00 pm are enough to note an alternative route, pack anything needed for the morning and still move calmly to the next commitment that same day. A short written note also prevents another timetable search later tonight.
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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