How to use the online alarm clock
As the curtain call finishes, set the alarm for 10:38 pm so you can leave the local theatre without lingering in the foyer. It gives you a clear cue to collect your coat, check the seat area and start towards the exit. With 11:00 pm approaching, that prompt can help keep the journey home from slipping later than planned.
Before relying on the alarm for the end of the performance, test its sound while there is still time to adjust it. Set a nearby trial alarm, raise the volume to a level you can recognise and confirm that the tone plays clearly. Keep this page running and the computer awake: otherwise, the theatre reminder will not sound when needed. After the check, set 10:38 pm again and leave the page undisturbed.
Leaving a theatre late in the evening often means moving from a lively auditorium into a much quieter street. Choose a signal that remains noticeable through applause and foyer chatter, but remember that it may feel much louder once the crowd thins. At 10:38 pm, keep headphones off as the alarm approaches, then silence it promptly outside to avoid disturbing nearby residents or people waiting at the bus stop.
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 10:38 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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