How to use the online alarm clock
You are watching the clock as the overnight supermarket shift edges towards its finish, waiting for 3:33 am before starting the final wrap-up. The alarm gives that moment a clear signal, so you need not keep checking the time while straightening the last shelves or completing a handover. It also leaves a manageable stretch before 4:00 am for the remaining closing duties.
For a supermarket finish at this hour, the alarm page needs to remain active until the sound plays. If you close its tab or browser, or allow the device to sleep, no alarm will sound to mark the end of your shift. A background tab is fine while you use another page, provided the browser stays open and the screen does not enter sleep mode. Setting an audible volume beforehand also avoids relying on a signal that is too quiet for the surroundings.
Leaving an air-conditioned supermarket during the night can mean stepping into noticeably warmer air, even at 3:33 am. A light extra layer that was comfortable beside chilled aisles may feel unnecessary in the car park, so having somewhere to carry it makes the change easier. Water ready for the journey home is also practical after several hours under air conditioning, particularly during a warm British spell.
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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