How to use the online alarm clock
If the evening is when you get things done — an assignment, a load of washing, dinner prep — 9:39 pm is a sensible time to set a firm reminder. This tool rings at 9:39 pm through your laptop or desktop speakers, whether the tab's open on the kitchen bench or the desk.
Start by selecting a tone from the dropdown, then hit Start to lock it in. From that point the page does the counting, and it'll ring once the time is reached, but only if the tab is still open somewhere on your device. Closing it, or the browser entirely, cancels the alarm.
A browser alarm like this one is handy when your phone's on silent, charging in another room, or you just don't want to unlock it and get pulled into notifications. The trade-off is honesty: it only rings while this tab stays open, so it's not a replacement for your phone alarm on a trip where the laptop lid might close. On a 24-hour clock 9:39 pm is written 21:39, and spoken aloud it's twenty-one minutes to ten at night. You'll also see it written 9.39 pm — a full stop instead of the colon means the same time. Setting the alarm to 9:39 pm tomorrow morning works the same way: if the time has gone for today, the count runs through to it.
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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