How to use the online alarm clock
As you hand over the shift, set the 9:52 pm alarm to prompt a final check of the night engineering works schedule for the Tube. It gives you a clear cue to confirm the affected lines, stations and planned access before the next person takes responsibility. With 10:00 pm approaching, there is still time to pass on any late change without leaving a vague note for the overnight team.
Background noise in a control room, depot or busy office can easily cover a browser alarm, especially when conversations and equipment are competing with it. Set the volume high enough to be distinct, then test it briefly from the place where you will actually be working. Keep another reminder if missing the check would disrupt the handover. This alarm works only while the browser remains active and the computer stays awake, so ending the session early could leave the engineering schedule unchecked.
For an evening handover, arrange the light so the timetable and your notes remain easy to read without glare on the screen. A desk lamp aimed across the page is more useful than a bright source reflected in the display. Prepare that lighting before 9:52 pm, particularly if the main office lights are dimmed later, and leave the controls within reach so the incoming engineer can review the same details comfortably.
Common questions
What happens if my laptop goes to sleep before 9:52 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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