The city’s community centers will open earlier and close later starting this week. Mayor Walsh announced the operational changes on Friday. All free-standing centers will be open Monday through Friday from 6:30 a.m.-9 p.m. On Saturdays, they will operate 9 a.m.- 5p.m. Boston Centers for Youth & Families (BCYF) centers in school buildings— including the Cleveland, Leahy-Holloran, Holland and Mattahunt will operate from 2 p.m. to 9 p.m., Monday through Friday. The city agency operates 36 facilities, including 20 free standing community centers and pool buildings and 16 based in school buildings.