Set the alarm clock for 6:36 pm

 

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

The alarm goes off in: ::
 
 

6:36 pm across the country

London6:36 pm
Birmingham6:36 pm
Manchester6:36 pm
Glasgow6:36 pm
Belfast6:36 pm

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

How to use the online alarm clock

Waking at 6:36 pm leaves you needing to get ready quickly if the mobile post office is due in the village. Settle your bearings, check where it stops and gather any letters or documents before leaving. The 24 minutes before 7:00 pm may be enough for a wash, a drink and the walk to the usual stopping place without turning the evening into a rush.

Because you have only just woken, the alarm sound may be routed to headphones that are still paired but lying out of sight. Check the audio destination and play a brief test before depending on the alert, then leave the volume high enough to hear from the next room. The mobile post office could be missed if the browser is closed or the phone falls asleep, because this alarm cannot then sound; use a separate phone alarm as a fallback for the departure time.

Stepping from an air-conditioned room into lingering afternoon heat can make the walk feel unexpectedly warm. Put water beside your letters now, choose a light layer and allow a moment outside before setting off. Keeping the air conditioning very cool until the last second may make the change harsher, so easing it back while you prepare can make leaving at this hour feel less abrupt.

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.