By default, when you run the history command, it lists the history of all commands previously executed, but it does not include a timestamp.

Adding a timestamp to the bash history can easily be accomplished with the HISTTIMEFORMAT Bash variable as shown.

export PS1="\u@\h:$(pwd)> "

As an added bonus, I like the PS1 variable in the example above because it lists the username, hostname, and full path in a single line.

Here's an example of the output: