Set the alarm clock for 11:45 am

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

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 11:43 am Alarm clock for 11:44 am Alarm clock for 11:46 am Alarm clock for 11:47 am

Going to bed for a 11:45 am alarm

Asleep by 2:30 am — 6 full sleep cycles, about 9 hours
Asleep by 4:00 am — 5 full sleep cycles, about 7 hours
Asleep by 5:30 am — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

11:45 am across the country

Sydney	11:45 am
Brisbane	11:45 am
Adelaide	11:15 am
Perth	9:45 am
Darwin	11:15 am

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

How to use the online alarm clock

Shift workers switching over around midday often need an alarm that isn't tied to their phone being nearby. This one rings at 11:45 am straight from the browser tab, so a laptop left open on the kitchen table can do the job just as well.

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.

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 11:45 am is written 11:45, and spoken aloud it's quarter to twelve in the afternoon. Timetables and rosters may show it as 11:45, and handwritten notes as 11.45 am. Whether you would say set alarm for 11:45 am or put an alarm on for 11:45 am, the steps are the same: pick a sound, press Start, leave the tab open.

Common questions

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.

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.