5 CFR § 315.804 - Termination of probationers for unsatisfactory performance or conduct.
(a) Subject to § 315.803(b), when an agency decides to terminate an employee serving a probationary or trial period because his work performance or conduct during this period fails to demonstrate his fitness or his qualifications for continued employment, it shall terminate his services by notifying him in writing as to why he is being separated and the effective date of the action. The information in the notice as to why the employee is being terminated shall, as a minimum, consist of the agency's conclusions as to the inadequacies of his performance or conduct.
(b) Probation ends when the employee completes his or her scheduled tour of duty on the day before the anniversary date of the employee's appointment. For example, when the last workday is a Friday and the anniversary date is the following Monday, the probationer must be separated before the end of the tour of duty on Friday since Friday would be the last day the employee actually has to demonstrate fitness for further employment.