How to use the online alarm clock
Before handing over the school-club pickup, set the 3:59 pm alarm and tell the other person exactly what it marks. It is the final prompt before 4:00 pm, giving them a clear cue to collect the schoolchild rather than relying on a hurried message or a glance at the clock. Keep the collection details separate so the alarm has one unmistakable purpose.
A schoolchild pickup may need a firmer sound than a quiet reminder used around colleagues, but the setting matters. Choose a gentle tone if the person taking over is already waiting nearby; use a more persistent one if they could be distracted by work or travel. Check the volume with the surrounding noise in mind. If the browser is no longer running or the phone falls asleep, the alarm may not sound, and the schoolchild could be left waiting at the club, so a separate phone alarm is sensible when the handover cannot fail.
Once the collection has been passed on, avoid letting a late-afternoon alarm disrupt sleep planned for later. A 3:59 pm alert is early enough to deal with promptly: acknowledge it, confirm that the other person has gone, then silence any duplicate reminders. That prevents forgotten alerts from sounding during an evening nap or remaining active into the night, preserving the rest available after the afternoon commitment is finished.
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 3:59 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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