How to use the online alarm clock
Waking at 6:11 pm means the National Trail route is still only a plan, so the first decision is whether there is enough daylight to finish it safely. An alarm for 7:00 pm can mark a firm turning point: if progress has been slower than expected, that is the moment to leave the trail by the planned exit rather than press farther into fading light.
For a walker preparing to set off, the alarm needs to be heard over clothing, packing and last-minute map checks. Check where the sound will play, especially if wireless headphones were connected earlier and are now sitting unnoticed in a pocket or bag. A short test can reveal that diversion before it matters. The route alarm cannot sound if the page is no longer running or the phone has gone to sleep, so it should not be the only safeguard for getting back before dark.
Because this is late afternoon, the useful light may change quickly with cloud, woodland and the season. Note the sunset time for the exact area, then choose the escape point while visibility is still comfortable. Keeping a torch accessible rather than buried in the rucksack also avoids searching for it after the path has already become difficult to see.
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 6:11 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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