How to use the online alarm clock
Finish checking the heating in the old stone house at 2:17 am, then lock up and leave knowing you have a clear reminder for the next inspection. The alarm marks the exact minute without making you wait until 3:00 am, which matters when draughty rooms, old radiators and a chilly hallway still need one final look before you head out.
That heating check depends on the alarm remaining able to play after you walk away, so confirm that the phone or laptop will stay awake until 2:17 am. If you close the browser page or let the device sleep, the alarm cannot sound and the heating in the house may go unchecked. Set the volume where it will be audible from the room you are finishing in, and avoid relying on a screen that normally powers down quickly.
Leaving a stone house during the night is easier when the route to the door is already visible. Before settling down, switch on a low hallway lamp or place a torch beside your keys, with its beam facing away from anyone sleeping nearby. At 2:17 am, this gives enough light to read the controls, check the radiator valves and leave safely without turning on harsh ceiling lights throughout the house.
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 2:17 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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