Set the alarm clock for 3:21 am

 

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

The alarm goes off in: ::
 
 

Going to bed for a 3:21 am alarm

  • Asleep by 6:06 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 7:36 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 9:06 pm — 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.

3:21 am across the country

Sydney3:21 am
Brisbane3:21 am
Adelaide2:51 am
Perth1:21 am
Darwin2:51 am

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

Online alarm clock for 3:21 am

With the surfboard already secured in the car, setting a 3:21 am alarm tonight keeps the pre-dawn departure simple. There is enough breathing room to grab your keys, check the tide and reach the coast before the light changes. You will also be moving well before 4:00 am, when more early traffic may begin appearing on Australian roads near popular breaks.

Your surf plans depend on hearing this alarm, so check the phone’s silent settings while you are preparing. Raise the alarm volume separately if your handset allows it, and play a quick test sound before bed rather than assuming the media volume controls everything. Keep this browser alarm active and the phone awake: if the page is closed or the handset goes to sleep, the surf alert may never sound and the tide window can pass without you.

A house can feel completely still at 3:21 am, which makes a sudden alarm seem much louder than it would after sunrise. Place the phone close enough to hear at a moderate level, but away from a shared wall or a sleeping partner’s pillow. Outside, listen for bins, gates and car doors; handling them gently keeps the quiet departure from carrying through the street.

Common questions

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.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

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.