It’s to my understanding that in the East Coast markets, the final local weekend editions of Ten Eyewitness News at 6pm aired on August 8, 1993.
The national 5pm bulletins started on August 20, 1994 - probably timed to coincide with the Commonwealth Games + the On-Air Presentation relaunch which resulted in the “Eyewitness” being dropped from the name of Ten News (…until it was brought back in 2013 of course)!