How to use the online alarm clock
As you finish checking the heating in an old stone house and prepare to leave, set the alarm for 12:51 am so the final inspection does not stretch unnoticed into the night. That leaves a clear marker before 1:00 am: enough time to confirm the controls are settled, gather your keys and torch, and lock up without turning the departure into another round through the rooms.
The hum of a boiler, a rattling fan or noise from the yard can mask a quiet signal, so choose a volume you can hear from wherever the heating check takes you. Keep the alarm close enough to be distinct without making it needlessly harsh in a silent house. No signal will bring you back to the heating if you close the browser or allow the computer to fall asleep, so use a separate alarm if you may step away before 12:51 am.
Leaving the house just after midnight can make the next commitment feel comfortably distant when it is actually later the same day. Before locking the door, note what time you must be ready again and work backwards for travel, food and sleep. Treat 1:00 am as the point to be outside with everything packed, giving the remaining nine minutes a single purpose: completing the heating check and leaving a sensible buffer before the next part of the day.
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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