0400 to 0455 converted
| Military | 12-hour | Spoken |
|---|
| 0400 | 4:00 AM | zero four hundred hours |
| 0405 | 4:05 AM | zero four zero five |
| 0410 | 4:10 AM | zero four ten |
| 0415 | 4:15 AM | zero four fifteen |
| 0420 | 4:20 AM | zero four twenty |
| 0425 | 4:25 AM | zero four twenty-five |
| 0430 | 4:30 AM | zero four thirty |
| 0435 | 4:35 AM | zero four thirty-five |
| 0440 | 4:40 AM | zero four forty |
| 0445 | 4:45 AM | zero four forty-five |
| 0450 | 4:50 AM | zero four fifty |
| 0455 | 4:55 AM | zero four fifty-five |
Any minute in this hour works the same way: 0407 is 4:07 AM, 0442 is 4:42 AM. Only the hour changes between the two systems; the minutes are copied across unchanged.
Other hours
The full chart, the converter and the rules are on the military time page.
Questions
Will the alarm ring if I close the tab or the laptop?
No. No website can ring after the browser is closed or the computer sleeps. Keep this tab open, plug in, and the clock keeps the screen awake for you. The Ready-to-ring check under the clock shows what is set up correctly.
Does it work on my phone?
Yes on Android while the tab is open (behind other tabs is fine). On iPhone the page must stay in the foreground because Safari does not let web pages play sound from the background. Add it to the Home Screen for a full-screen bedside clock.
Is it loud enough for heavy sleepers?
Pick Loud buzzer or Siren, set the volume slider to full, and switch on the sums-to-stop option in Settings so the alarm cannot be dismissed half asleep. The sunrise light brightens the screen before the alarm too.
Can I use my own sound?
Yes. In Settings, choose an MP3, WAV or OGG file. It is stored in this browser only and never uploaded. There are also 60 built-in sounds, from a twin-bell alarm clock and a rooster to an air horn and a music box, on the sounds page.
What do the sleep sounds do?
Rain, brown noise, white noise, fan and ocean are generated in the browser and play until the alarm, then fade out as it rings. They keep the tab active through the night.
Does it need an internet connection?
Only to load the page the first time. Alarms, sounds, the sleep calculator and the sunrise math all run on your device, and the page works offline once it has been opened.
Is anything stored or sent?
Alarms and settings are saved in your browser's local storage. Nothing is sent to a server, and there is no account.
How do you say 0400?
“zero four hundred hours”. With minutes, say both numbers: 0430 is “zero four thirty”.
Is 0400 AM or PM?
4:00 AM. Anything below 1200 is AM.
Can I set an alarm for a military time?
Yes. Press Set an alarm for 0400 above; it rings in this tab at 4:00 AM in your own time zone, with a full-screen stop button and snooze.