How to use the online alarm clock
As you hand over responsibility for unlocking the choir rehearsal hall, set the alarm for 9:51 pm and make the change of keyholder explicit. That leaves a clear checkpoint before 10:00 pm, when singers may already be approaching and expecting access. Include the venue name in the alarm label so the person taking over knows exactly what the signal means.
Before the next keyholder leaves home, check where the alarm sound will emerge. A phone or computer may quietly route it to connected headphones, even when nobody is wearing them, leaving the room silent. Disconnect the headphones or play a brief test at an audible level, then confirm that 9:51 pm is selected rather than 9:51 am. If the browser alarm is no longer running at that moment, it cannot remind anyone to unlock the hall, so use a separate phone alarm when the handover must not depend on the browser remaining active.
Because this handover happens late in the evening, consider the other people in the house before turning the volume up. Keep the phone nearby on a hard surface and choose a short, distinct tone instead of a prolonged loud signal. Put the hall keys and coat together by the door as well; the alarm can then prompt a quiet departure without waking someone in another room while you search.
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 9:51 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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