How to use the online alarm clock
An afternoon alarm at 5:21 pm works well for anyone who's ducked away for a quick rest and doesn't trust themselves to wake up on their own. Set the time, choose a tone, and leave the tab open. It'll ring at 5:21 pm through your laptop or desktop speakers.
Pick whichever sound you're most likely to actually notice, then press Start. The alarm is tied to this browser tab, so it needs to stay open. Minimising the window is fine, but closing the tab or the browser will stop the countdown before it ever rings.
This works well as a second alarm, one that isn't tangled up with phone notifications, do-not-disturb settings, or low battery. It genuinely won't ring if the tab gets closed or the device goes to sleep, so treat it as a backup or a work-desk tool rather than the only alarm for something important. On a 24-hour clock 5:21 pm is written 17:21, and spoken aloud it's twenty-one minutes past five in the evening. Timetables and rosters may show it as 17:21, and handwritten notes as 5.21 pm. Set an alarm for 5:21 pm, set the alarm to 5:21 pm, set my alarm for 5:21 pm — all of it lands on this page and does the same thing.
Common questions
Do I need to create an account or download anything?
No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.
Can I change the alarm sound?
Yes, there's a short list of tones to choose from before you press Start. Pick whichever one you're most likely to actually hear — softer sounds are easier to sleep through than a firm chime or bell.
What happens once the alarm goes off?
It rings through your device's speakers on a loop until you stop it from this page. There's no separate app notification, so make sure your volume is turned up before you rely on it.
Is this alarm accurate across daylight saving time?
It uses your device's local clock, so as long as your computer's time and date settings are correct, it'll adjust automatically when daylight saving time starts or ends.
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