Set the alarm clock for 12:30 am

 

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

The alarm goes off in: ::
 
 

12:30 am across the country

London12:30 am
Birmingham12:30 am
Manchester12:30 am
Glasgow12:30 am
Belfast12:30 am

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

How to use the online alarm clock

Breaking away from drying kit at 12:30 am can be difficult, but the tents still need checking after a storm in the Lake District. Setting the alarm for this half-hour point gives the current job a clear stopping place, with 1:00 am as a natural marker for finishing the inspection or deciding what needs attention at first light.

A tent check in wind and rain calls for an alarm tone that matches the conditions. A softer sound may be enough indoors when everything is quiet, while a more persistent tone suits a noisy kitchen, common room or sheltered porch where rain could mask it. The volume can be tested before returning to the task, then left high enough to cut through conversation and weather. This browser alarm cannot sound after its page has stopped running, so relying on it alone could leave the tents unchecked; keeping the computer awake and the alarm active avoids that gap.

Moving outside around midnight is easier when the change in light has been prepared for. A dim lamp beside the work area preserves some awareness of the dark, while a charged torch by the waterproofs prevents a last-minute search. Pointing the beam towards paths and guy lines, rather than across nearby pitches, also reduces glare for anyone sleeping close by.

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.