How to use the online alarm clock
Night owls and shift workers both end up setting alarms around 11:39 pm, just for different reasons — one to stop, one to start. Pick a sound, set it for 11:39 pm, and this page will ring through your browser for as long as the tab's open.
After picking a tone, press Start and leave the page open. It doesn't need an internet connection once it's running, but it does need the tab itself to stay open, so avoid closing the browser or letting the device fall asleep before the time is reached.
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 11:39 pm is written 23:39, and spoken aloud it's twenty-one minutes to twelve at night. You'll also see it written 11.39 pm — a full stop instead of the colon means the same time. Set an alarm for 11:39 pm, set the alarm to 11:39 pm, set my alarm for 11:39 pm — all of it lands on this page and does the same thing.
Common questions
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.
Can I use this on my phone instead of a laptop?
Yes, it works in a mobile browser the same way, but phones are more likely to lock the screen or sleep, which can stop the alarm from ringing. A laptop or desktop tends to be more reliable for this.
Can I set more than one alarm at a time?
This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.
Why use a browser alarm instead of my phone's built-in one?
Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.
Cookie policy