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Use Clock for a time-based alarm, Microsoft To Do for a task reminder, and a supported calendar for an appointment. Check whether the computer needs to be awake; a reminder set on a sleeping or powered-off PC may not alert you when expected.
Choose the right tool
| Need | Useful option |
|---|---|
| An alarm or countdown while using the PC | Windows Clock. |
| A task with a due date and notification | Microsoft To Do. |
| An appointment with start/end time and participants | A supported calendar such as Outlook. |
Set a Clock alarm
- Search Start for Clock and open the app.
- Select Alarm and add an alarm.
- Choose the time, repeat days, label, sound and snooze options offered.
- Save it and confirm it is enabled.
- Test a short alarm while the PC is awake and check the volume.
Microsoft’s Clock guide warns about alarms that only appear when the device is awake. Follow any warning shown on your device and review its power/sleep settings. Don’t assume all alarms sync to every device on the same account.
Set a task reminder in To Do
Create or select a task, choose Remind me and set a date/time. A due date records the deadline; a reminder schedules an alert. Set it to repeat only if it’s a task you do regularly.
Microsoft’s To Do instructions explain these separate controls. Check the account and notification permissions on each device where you expect an alert.
Use a supported calendar for appointments
The old Windows Mail, Calendar and People apps reached end of support in December 2024. Microsoft’s transition guidance directs users toward Outlook. Use your current calendar’s event editor instead of expecting the old taskbar event-entry box to exist on every Windows version.
Check an alert before relying on it
- Confirm the date, time, repeat schedule and time zone.
- Check notification permissions and Focus/Do Not Disturb settings.
- Test sound and whether the device will be awake.
- For an important deadline, use another device or accepted reminder method as well.
Frequently asked questions
Does a due date automatically create a reminder?
Check the separate reminder field. A task deadline and a scheduled notification serve different purposes.
Will an alarm work with the PC turned off?
Do not rely on it. Follow the Clock app warning on your device and test with the PC awake, notifications allowed and the volume audible.
Should I use an alarm or a timer?
An alarm targets a time of day. A timer counts down a duration. Choose the one that matches the task, then check that it is running or enabled.
Are the old Windows Calendar instructions still current?
The old Mail and Calendar apps are no longer the current supported route. Use a supported calendar such as Outlook and check its event reminder.