Why does my Bash script say "command not found" when I try to display the date and time?

You’re not dumb—you’re probably just still getting familiar with the shell. What exact command are you running, and what does the script contain? The full error message matters. If the script’s goal is simply to print the date and time, the basic command is `date`. You can read about its options with `man date`.

For a script, make sure the file contains something like `#!/bin/bash` on the first line and `date` on the next. Then either run it with `bash filename.sh`, or make it executable with `chmod +x filename.sh` and run it as `./filename.sh`. If you type only the filename, the shell may not search the current directory and report that it can’t find the command.