From and after March 14, 2020, the board of supervisors of any county, the governing authority of any municipality and the local school board of any public school district may grant administrative leave with pay during the affected period within the affected county, municipality or school district to the employees of such governmental entities on a local or statewide basis in the event of extreme weather conditions or in the event of a man-made, technological or natural disaster or emergency, if such event has resulted in an emergency declaration by the Governor. Any employee on a previously approved leave during the affected period shall be eligible for such administrative leave granted by the governing authority, and shall not be charged for his or her previously approved leave during the affected period.