How to use the online alarm clock
Finish your greenhouse frost check at 3:39 am, then set the alarm before leaving the plot. It can mark the point when you need to look again, rather than keeping you outside until 4:00 am. Allow enough time to secure the greenhouse door, put away the torch and walk back indoors without rushing.
Because the phone or laptop may go to sleep before the alert is due, check its power and sleep settings while you are still at the greenhouse. This browser alarm cannot sound if the page is no longer running or the device has gone to sleep, so the next greenhouse check could be missed. Keep the page active, leave the sound audible, and use a separate alarm clock if the frost watch cannot safely depend on a browser.
After stepping out at this hour, notice whether the air feels damp and check exposed surfaces for moisture rather than judging conditions only by the greenhouse glass. Night humidity can leave paths, decking and metal latches wet, while a light breeze may make work at 3:39 am less comfortable. Wipe your hands before handling a phone, fasten the door carefully, and keep the return route clear for the later check.
Common questions
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
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.
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