5 U.S. Code § 6129
5 U.S. Code § 6129 is about Administration of leave and retirement provisions. It is under Subchapter II (Flexible And Compressed Work Schedules) of Chapter 61 (Hours Of Work) of Subpart E (Attendance and Leave) of Part III (Employees) of Title 5 (Government Organizations and Employees) of the Code.
For purposes of administering sections 6303(a), 6304, 6307(a) and (d), 6323, 6326, 6327, and 8339(m) of this title, in the case of an employee who is in any program under this subchapter, references to a day or workday (or to multiples or parts thereof) contained in such sections shall be considered to be references to 8 hours (or to the respective multiples or parts thereof).