How to use the online alarm clock
While waiting to check the night engineering works schedule, you can set the alarm for 10:19 pm and keep an eye on the remaining evening. The alert marks the appointed moment without forcing you to watch the clock continuously. There are 41 minutes between then and 11:00 pm, leaving a useful window to read any service details and note which Underground lines or stations may be affected.
A quick signal check now makes the later alert less uncertain: set a test alarm a minute ahead, confirm that its sound is clear, then return the time to 10:19 pm. The volume should be high enough to hear from where you will be checking the engineering information. Because this browser alarm cannot sound after the page is closed or the device goes to sleep, the schedule check could be missed unless the browser remains open and the screen stays awake.
Evening noise can shift noticeably as 10:19 pm approaches, especially if television, conversation or traffic has been masking quieter sounds. A practical arrangement is to place the phone nearby on a firm surface and choose a signal that stands apart from the room’s background noise. If the surroundings are likely to become quieter before 11:00 pm, a moderate volume may be easier to notice without making the alert unnecessarily harsh.
Common questions
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.
Does the alarm still work if I close the tab?
No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.
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