How to use the online alarm clock
While you wait to open the Royal Mail sorting centre, a 2:40 am alarm gives you a clear marker without repeatedly checking the clock. It also leaves a useful twenty-minute margin before 3:00 am, enough time to gather keys, check access details and be ready for the first tasks of the shift.
For this opening, the alarm sound needs checking before you rely on it: silent mode may suppress browser audio even when the alarm appears correctly set. A brief sound test at the same volume setting can reveal that problem. This browser alarm cannot ensure the Royal Mail sorting centre opens on time if its page has been dismissed or the handset has suspended it, so a separate phone alarm provides sensible backup.
Because the signal will sound during the night, consider where other people in the house are sleeping. Keeping the phone close to you allows a lower volume, while vibration on a hard bedside surface can still be surprisingly loud in another room. A soft surface reduces that rattling, but should not cover the speaker; placing the phone within reach also lets you silence 2:40 am promptly.
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 2:40 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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