To delete all events from a specific time period from all calendars in your Microsoft calendar, follow these steps:

1. Open the Microsoft Calendar app on your device.


2. From the left-hand side of the page, select the calendar you want to delete events from.


3. Select the Edit option from the toolbar at the top of the page.


4. At the top right corner of the page, select the range of time option.


5. Select the start and end date range within which you want to delete all events.


6. From the page that appears, check the events you want to delete and then click the delete button.


7. Your selected calendar will have now been cleared of events within the selected date range.