Setting Your Alarm for 12:00 AM
The alarm controls are pre-set to 12:00 AM. Choose a sound, use Test Sound to confirm your volume, then press Set Alarm. Keep this tab open and the device awake until the alarm rings.
What this 12:00 AM preset does
- Preselected time: The controls load at 12:00 AM (00:00 in 24-hour format).
- Sound check: Choose a tone and press Test Sound before relying on it.
- Saved locally: When you set the alarm, it is stored in this browser and appears under My Alarms.
- Browser limitation: This tab must stay open and the device must remain awake for the alarm to ring.
Where 12:00 AM sits in the day
12:00 AM is twelve o'clock and falls in the late night. This time falls after midnight and before the pre-dawn hours. It is exactly on the hour.
The midnight hour begins a new calendar day, so confirm the date as well as the time when the alarm is for a deadline or departure. This preset is on the hour, a simple boundary that is easy to scan in a schedule.
Because the alarm lands exactly on an hour boundary, it is a clear choice when a timetable lists only a whole hour. If the hour marks the event itself, use one of the earlier buffer alarms below for preparation rather than changing this final cue.
Measured forward from 12:00 AM, the next noon is 12 hrs away. This makes it easier to check whether the preset belongs to the intended half of the day before activating it.
For a late-night alarm, verify both the AM setting and the calendar date associated with the task. Browser alarms depend on an awake device and an open tab, so use a system alarm or another device as the primary safeguard when missing the cue would matter.
Plan backwards from 12:00 AM
If 12:00 AM is the actual start time, an earlier alert can reserve preparation time. Choose the 11:50 PM alarm for a 10-minute warning, the 11:45 PM alarm for 15 minutes, or the 11:30 PM alarm for a 30-minute buffer. Keep this 12:00 AM preset as the final cue if you need both a warning and an exact-time alarm.
If the task can start a little later, the 12:10 AM preset moves the cue 10 minutes after 12:00 AM. Use the time that matches the action you need to take; an alarm label such as “leave now,” “join meeting,” or “stop task” is clearer than a label containing only the time.
12:00 AM at a glance
| 12-hour time | 12:00 AM |
|---|---|
| 24-hour time | 00:00 |
| Military time | 0000 (zero hundred hours) |
| Written in words | Twelve o'clock |
| Spoken time | Twelve o'clock AM |
| Part of day | Late Night |
| Minutes since midnight | 0 |
| Seconds since midnight | 0 |
| Day completed at this time | 0.00% |
| Time remaining to next midnight | 24 hrs |
| Smaller clock-hand angle | 0.0° |
Possible uses for a 12:00 AM alarm
This preset can be used for any task tied to 12:00 AM. Depending on your own schedule, examples include:
- An overnight check
- A late-shift reminder
- A travel or departure alert
For a task-focused setup, see the reminder alarm guide. To choose a completely different time, browse all online alarm presets.
Time from each whole hour to 12:00 AM
The table shows the forward interval from the start of each hour to the next occurrence of 12:00 AM.
| Whole-hour reference | ||
|---|---|---|
| From 12:00 AM | 0 min | 0 min |
| From 1:00 AM | 23 hrs | 1,380 min |
| From 2:00 AM | 22 hrs | 1,320 min |
| From 3:00 AM | 21 hrs | 1,260 min |
| From 4:00 AM | 20 hrs | 1,200 min |
| From 5:00 AM | 19 hrs | 1,140 min |
| From 6:00 AM | 18 hrs | 1,080 min |
| From 7:00 AM | 17 hrs | 1,020 min |
| From 8:00 AM | 16 hrs | 960 min |
| From 9:00 AM | 15 hrs | 900 min |
| From 10:00 AM | 14 hrs | 840 min |
| From 11:00 AM | 13 hrs | 780 min |
| From 12:00 PM | 12 hrs | 720 min |
| From 1:00 PM | 11 hrs | 660 min |
| From 2:00 PM | 10 hrs | 600 min |
| From 3:00 PM | 9 hrs | 540 min |
| From 4:00 PM | 8 hrs | 480 min |
| From 5:00 PM | 7 hrs | 420 min |
| From 6:00 PM | 6 hrs | 360 min |
| From 7:00 PM | 5 hrs | 300 min |
| From 8:00 PM | 4 hrs | 240 min |
| From 9:00 PM | 3 hrs | 180 min |
| From 10:00 PM | 2 hrs | 120 min |
| From 11:00 PM | 1 hr | 60 min |
Before you rely on this alarm
Confirm the displayed time, device volume, and audio output. For an important wake-up, appointment, or safety-critical reminder, use a phone or another device as a backup.
Nearby alarm options
If 12:00 AM is close but not exact, these nearby presets let you move the alarm by 5, 10, or 15 minutes without returning to the full directory. Pick an earlier time to create a buffer, or a later time when the task can wait.
- 11:45 PM alarm - earlier buffer
- 11:50 PM alarm - earlier buffer
- 11:55 PM alarm - earlier buffer
- 12:05 AM alarm - backup reminder
- 12:10 AM alarm - backup reminder
- 12:15 AM alarm - backup reminder
12:00 AM alarm questions
What is 12:00 AM in 24-hour and military time?
12:00 AM is 00:00 on a 24-hour clock and 0000 in military time.
What part of the day is 12:00 AM?
12:00 AM falls in the late night. This time falls after midnight and before the pre-dawn hours.
Will this browser alarm work for 12:00 AM if the tab is closed?
No. Keep this Alarm.now tab open and your device awake. Background tabs can continue running, but closing the tab, quitting the browser, or putting the device to sleep stops the web alarm.
Can I change 12:00 AM?
Yes. Change the hour, minute, or AM/PM control before pressing Set Alarm, or open another nearby preset below.