How to use the online alarm clock
While you watch the clock for the right moment to check the overnight engineering works timetable, an alarm set for 8:48 pm can mark the exact minute without repeated glances at your phone. It also leaves 12 minutes before 9:00 pm, enough to read the planned closures and note whether your usual Tube route will still run later tonight.
Your timetable check may continue in another browser tab while this alarm waits in the background. Some browsers reduce activity on pages that are no longer visible, so make sure this page remains loaded and that its sound can still be heard. If the page is closed or your phone or computer falls asleep, no alert will sound, and the timetable could go unchecked before you need the information. A brief sound test beforehand helps reveal muted audio or an overly low volume.
Because 8:48 pm falls well into the evening, bright room lighting can make a quick timetable check feel more intrusive than it needs to be. Before the alarm time, lower the main light or switch to a smaller lamp near the screen, while keeping enough illumination to read route details clearly. Adjusting the light in advance means the alert can remain the only abrupt change when the appointed minute arrives.
Common questions
What happens if my laptop goes to sleep before 8:48 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.
Cookie policy