• a valid start date (year, month, day) in the calendar.
• a valid end date (year, month, day) in the calendar.
• Click on 'Delete calendar data'
  then on 'Confirm deletion...'

Result :

• Calendar and activity tracking data corresponding to a day between the start date and the end date inclusive will be deleted.
• The following will not be deleted:
  - Periodic reports and activity monitoring data relating to the end of a month, quarter, semester or year.
  - The birthdays to wish and the holidays to wish, recalled in the calendars of each year.
  - Calendar personalization data .

• Automatic activity planning
• All sample calendars