How to use the online alarm clock
You are halfway through checking bags and travel documents when the 6:16 am alarm needs to pull you away. It marks the moment to stop preparing at home and begin the journey for security before an early flight from Heathrow. Leaving then also gives you a clear reference point before 7:00 am, instead of letting one last task quietly consume the available time.
Heathrow preparations can involve a kettle, radio, shower or other background sounds, so the alarm needs enough volume to cut through them. Set the sound level while that noise is actually present, rather than testing it in a silent room. If the browser page is dismissed or the phone or laptop falls asleep, no signal will sound and the Heathrow flight could be missed; another alarm is sensible if the departure cannot tolerate that risk.
Before leaving for Heathrow in the dim early light, keeping the screen less dazzling makes the final checks easier to follow. A lower brightness and a warm display setting can reduce the harsh contrast between the screen and the room. Place the phone where the time remains readable without staring at it, then use a small lamp for passports, tickets and bag labels instead of relying on the bright display alone.
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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