How to use the online alarm clock
Preparing now for security before an early flight from Heathrow makes the 8:03 am alarm one less detail to hold in your head. Set it while checking your travel documents, liquids and route to the terminal, then leave enough time for the journey and the airport queue. By 9:00 am, you can be moving through the morning rather than wondering whether you allowed enough time.
During your Heathrow preparations, this alarm can remain ready while you use another browser tab for travel details. A tab moved into the background will usually keep its alarm, although some browsers may limit activity that is out of view. Keep the alarm page available and check that sound is permitted. If the browser stops running or power saving suspends it, the alarm for your early flight may not sound, so use a separate alarm when missing it would disrupt the journey.
Planning an 8:03 am start also means deciding how much sleep remains before leaving for Heathrow. Finish packing and lay out clothes the evening before, so the alarm marks the point to get up rather than the start of more preparation. Keep the phone or computer far enough away that silencing it requires a deliberate movement, and avoid adding repeated alarms that divide the final part of the night into short stretches.
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 8:03 am?
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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