How to use the online alarm clock
You are halfway through another task when 5:51 am arrives, but the railway replacement timetable needs checking before 6:00 am. An alarm at this precise time gives you a clear point to break off, pick up your phone and look for changes affecting the first trains. The nine-minute gap is enough for a focused check without turning the interruption into a long pause.
A timetable check is only useful if the alert is audible when you need to change tasks. Set the alarm, then test its signal beforehand at the same volume and through the same speakers you intend to use; a barely audible sample now could be missed later. If you close the tab or let the device sleep, no alarm will sound, so the railway timetable may go unchecked. Keeping the browser available and the device awake prevents that particular interruption from silently disappearing.
Before dawn, the house and street may be quiet enough for a modest alarm tone, yet background noise often grows as 6:00 am approaches: heating starts, kettles boil and early traffic becomes noticeable. Place the device near where you are working rather than across the room, and choose a signal distinct from those sounds. That makes 5:51 am recognisable without setting a harsh volume that disturbs everyone nearby.
Common questions
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.
What happens if my laptop goes to sleep before 5:51 am?
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.
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