what time zone is vietnam
1 South Vietnam time zone was changed to GMT+8 from 23:00 1 January 01 1960, passing 60 minutes. 2  North Vietnam confirmed official UTC+7 from 1 January 1968.  Following the Fall of Saigon in AprilâMay 1975, reunified Vietnam then observes UTC+7 with Saigon (and other southern parts) delaying 60 minutes on 13 June 1975.