N.Y. Comp. Codes R. & Regs. tit. 4, § 28-3.3 – Use of donated leave credits.

(a) For employees subject to the sick leave provisions of Subpart 28-1 of this Part, donated credits may be used at employee option either in full day units following exhaustion of all available leave credits and prior to any sick leave at half-pay available to the employee pursuant to section 28-1.5 of this Part or in either full-day or half-day units following exhaustion of all available leave credits and any sick leave at half-pay available to the employee pursuant to section 28-1.5 of this Part.
(b) For employees subject to Subpart 28-2 of this Part, donated credits may be used in full-day units after all available leave credits are exhausted and prior to receipt of any disability benefits available to the employee pursuant to that Subpart.