(b) Subject to the requirements of this title, the Secretary shall adopt regulations, policies, and guidelines that:

(1) govern all aspects of leave and the keeping of time records for all employees subject to this section;

(2) require each unit subject to the regulations to submit to the Secretary an annual report that includes:

(i) the total number of employees in the unit; and

(ii) the aggregate amounts of annual, personal, and sick leave taken by the employees in the unit;

(3) provide for computations in a pay period of:

(i) accruals of annual and sick leave; and

(ii) deductions for unpaid leave used; and

(4) provide for conversions of leave time and holiday time for employees who do not have an 8-hour daily work schedule.