How to use the online alarm clock
Watching the clock for a late performance at your local theatre, you need the 11:01 pm alarm to mark the moment you should get moving. It keeps that decision separate from casual checks of the time as the evening approaches 12:00 am, whether you are waiting at home or finishing something nearby before leaving.
Because the theatre visit depends on hearing the signal, an early test can prevent a silent surprise later. Choose the alarm sound, set the volume you expect to use, and trigger a brief trial while there is still time to correct anything. Your theatre departure will have no audible reminder if this page is shut or the phone has gone to sleep, so a separate alarm on the handset is sensible when missing the cue would make you late.
A late trip to the theatre is easier when the room is prepared before 11:01 pm arrives. Keep enough light nearby to find keys, tickets and a coat without searching, but reduce harsh overhead lighting while you wait. If you will leave through a dark hallway or shared entrance, switching on a small lamp beforehand helps you move promptly without flooding the whole space with light.
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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