Answer: The late show with David Letterman first premiered in 1993.
Some extra relevant information:
The Late Show with David Letterman first premiered on August 30, 1993. The show aired on CBS and quickly gained popularity with audiences for its unique blend of comedy, interviews, and segments. David Letterman, who had previously hosted Late Night with David Letterman on NBC, brought his signature wit and charm to the late-night talk show format. The Late Show with David Letterman ran for over two decades before Letterman retired in 2015, leaving behind a lasting legacy in the world of late-night television.