Scenario: A trigger must be created that changes the Priority field to 1 in the Account record 10 days after an Account record is created. DIFFINDAYS (date and time, date and time): Returns the difference in days between two Date and Time fields. If both dates and times fall on the same day, the difference is zero. Note: Whenever we talk about history, the bone of contention are the below four fields: CreatedOn ModifiedOn CreatedBy ModifiedBy Reference: https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/customize/define-calculated-fields