How to use the online alarm clock
You are halfway through what you are doing when the 9:42 pm alarm needs to pull you away to collect your teenager from Army Cadets. Setting it for the exact time gives you a firm stopping point, with 18 minutes still available before 10:00 pm for putting things away, finding your keys and getting ready to leave.
Because the Army Cadets collection depends on hearing the alert, check the sound before relying on it: set a brief trial alarm, confirm the volume is audible from where you are working, then reset it for 9:42 pm. Keep this browser alarm actively running until it rings; if the browser session ends or the computer goes to sleep, the Army Cadets pickup alert will not sound, so a separate phone alarm provides a sensible fallback.
A late Army Cadets run can take a larger bite out of the night than the journey itself if bedtime preparations are left until afterwards. During the evening, have anything needed for sleep ready before departure: lock up, switch off unused lights and leave tomorrow’s essentials together. Returning to fewer unfinished jobs makes it easier to preserve the sleep still available after the 9:42 pm reminder.
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 9:42 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.
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