(c)
Annual leave in excess of the amount allowable—
(1)
under subsection (a) or (b) of this section which was accumulated under earlier statute; or
(2)
under subsection (a) of this section which was accumulated under subsection (b) of this section by an employee who becomes subject to subsection (a) of this section;
remains to the credit of the employee until used. The excess annual leave is reduced at the beginning of the first full biweekly pay period, or corresponding period for an employee who is not paid on the basis of biweekly pay periods, occurring in a year, by the amount of annual leave the employee used during the preceding year in excess of the amount which accrued during that year, until the employee’s accumulated leave does not exceed the amount allowed under subsection (a) or (b) of this section, as appropriate.