Set the alarm clock for 12:58 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

12:58 am across the country

London12:58 am
Birmingham12:58 am
Manchester12:58 am
Glasgow12:58 am
Belfast12:58 am

Times are worked out live in your browser, so daylight saving is already accounted for.

How to use the online alarm clock

While preparing to accept a late-night delivery at the pub, setting an alarm for 12:58 am gives you time to put keys, paperwork and a torch where they are easy to reach. You can be ready at the door before 1:00 am without repeatedly checking the clock or getting absorbed in another closing task.

A quick rehearsal earlier in the evening confirms that the signal is loud and recognisable before the driver is outside. Set a temporary alarm a minute or two ahead, check the phone’s volume and hear what actually happens in the room, then replace it with 12:58 am. Keep the phone awake and this page running; otherwise the delivery may arrive without the alarm sounding, leaving the driver waiting while you remain inside.

Because the delivery falls in the quietest part of the night, consider everyone else in the house before choosing the volume. Keep the phone close to your side of the bed, use vibration alongside a moderate sound, and avoid placing it on a hollow bedside cabinet that amplifies every buzz. If someone is sleeping nearby, tell them why the 12:58 am alarm is set so the brief disturbance does not cause unnecessary confusion.

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.