More info here
# Dry-run in current directory:
exiftool -d %Y%m%d_%H%M%S-c.%%e "-testname<CreateDate" .
# Rename all files with "CreateDate" in directory and add copy number if required:
exiftool -d %Y%m%d_%H%M%S%%-c.%%e "-filename<CreateDate" .
More info here
# Dry-run in current directory:
exiftool -d %Y%m%d_%H%M%S-c.%%e "-testname<CreateDate" .
# Rename all files with "CreateDate" in directory and add copy number if required:
exiftool -d %Y%m%d_%H%M%S%%-c.%%e "-filename<CreateDate" .