New Fitness Center hours in effect Published Feb. 16, 2011 By Joint Base Charleston Public Affairs JOINT BASE CHARLESTON, S.C. -- Effective immediately, the Fitness Center has new weekday operating hours. The facility now opens at 5 a.m and will remain open until midnight. Monday-Friday: 5 a.m. to midnight Saturday & Sunday: 6:39 a.m. to 6 p.m. Holidays: 10 a.m. to 6 p.m. Family Down Days: 6:30 a.m. to 6 p.m.