How to use the online alarm clock
While you watch the time and wait to leave for the castle tour, an alarm at 12:54 pm gives you a clear cue to move. It leaves a small margin before 1:00 pm for gathering your coat, checking the meeting point and walking towards the entrance without repeatedly looking at the clock.
Your castle visit depends on hearing the signal, so it is worth checking the alarm sound before the appointed moment. A brief test confirms that the volume is audible and that the chosen tone stands out from nearby conversation. The browser alarm also needs its page to remain open and your phone or computer to stay awake; closing the page or letting the device sleep means the castle tour reminder will not sound.
Waiting near a castle around midday can put you in strong sunshine outdoors, followed by much dimmer rooms inside. Before 12:54 pm, you can move into open shade while keeping the entrance or meeting place visible. Reducing screen brightness slightly may make the display more comfortable outside, but leave it bright enough to check the time at a glance as 1:00 pm approaches.
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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