You can set the alarm in Windows 10 at any time you want and here is how you can do it:
That's it. The alarm is successfully set.
Keep in mind that you can turn off an alarm at any time you want by clicking on its toggle.
The alarm will appear as a notification with the sound you chose at the time you specified.
You can dismiss the alarm using "Dismiss" option, OR you can snooze it using "Snooze" option. Before snoozing alarm, you can change snooze time (if you wish) by using the drop-down list under "Snooze for" in the notification.
Remember that even if the PC is locked, the alarm will appear.
Also, note that if the PC is in Sleep, then the alarm will not appear. When you wake up your PC from Sleep, then the alarm will appear.
To edit an alarm: click on the one you want to edit. Do the changes you want and then click on "Save" icon at the bottom.
To Delete an individual alarm: right-click on the one you want to delete. Click on "Delete" option.
To Delete multiple alarms at once: click on the "Select alarms" icon which is beside the "+" icon at the bottom. Select the alarms you want to delete and then click on "Trash Can" icon at the bottom.
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How to Set, Edit and Delete Alarm in Windows 10