Set alarm for 8:45 AM
Recently used Functions
| Alarm 11:59 AM | 11:59 AM |
| Alarm 11:59 PM | 11:59 PM |
| Alarm 6:00 AM | 6:00 AM |
| Alarm 7:00 AM | 7:00 AM |
| Alarm 8:00 AM | 8:00 AM |
| Alarm 9:00 AM | 9:00 AM |
| Alarm 10:00 AM | 10:00 AM |
| Alarm 12:00 PM | 12:00 PM |
| Alarm 7:55 PM | 7:55 PM |
| Alarm 6:55 PM | 6:55 PM |
Sleeping backwards from 8:45 AM
If 8:45 AM is fixed, the variable is bedtime. These options each complete a whole number of ~90-minute sleep cycles before the alarm sounds, allowing about 15 minutes to fall asleep.
| 11:31 PM (the night before) | 6 sleep cycles | 9 hours of sleep |
| 1:01 AM | 5 sleep cycles | 7.5 hours of sleep |
| 2:31 AM | 4 sleep cycles | 6 hours of sleep |
These are planning figures, not medical advice — cycle length varies between people and from night to night.
Reading 8:45 AM
An 8 a.m. alarm suits later starts, students, and anyone whose working day begins at nine.
| 12-hour clock | 8:45 AM |
| 24-hour clock | 08:45 |
| Military time | 0845 |
| Relative to midday | 3h 15m before midday |
| Since midnight | 525 minutes (36% of the day) |
| Until midnight | 915 minutes |
If you set this alarm right now it would ring in about 11h 40m, tomorrow.
About setting an alarm for 8:45 AM
What time do I need to sleep to wake up at 8:45 AM?
To get about 7.5 hours you would fall asleep around 1:01 AM, or 11:31 PM for a fuller 9 hours. Both allow roughly 15 minutes to drop off and finish on a complete sleep cycle.
What is 8:45 AM in 24-hour time?
8:45 AM is 08:45 on a 24-hour clock, written 0845 in military and aviation formats. It sits 3h 15m before midday and 525 minutes after midnight.
Will this 8:45 AM alarm work if I close the tab?
No. The alarm runs in the page, so the tab has to stay open, though it can be in the background and it keeps working without an internet connection once loaded. Bookmark the page and the 8:45 AM setting is restored when you open it again.
How the 8:45 AM alarm works
No setup needed — 8:45 AM is already dialled in. Hit Set Alarm to start the countdown to the next 8:45 AM. The page works offline once loaded, and bookmarking it keeps the time.
Set the hour and minute for the online alarm clock. Once you set the hour and minute for the online alarm clock, the alarm message will appear, and the preselected sound will play at the set time. You can also click the 'Test' button to preview the alert and check the sound volume.
You can customize the alarm clock's appearance, including text color, type, and size, and these settings will be saved for the next time you open your web browser.
The online alarm clock won't work if you close your browser or shut down your computer, but it can work without an internet connection. This free online alarm clock will reliably wake you up.
You can add links to online alarm clocks with different time settings to your browser's Favorites. Opening one of these links will automatically set the alarm clock to the predefined time.