If you add this line to the end of your .bashrc file, you will get the date and the time showing in your prompt -
PS1="[\u:\d \t @\w]$>; "
And if you add this ... [\!] ...onto the end of that line like this;-
PS1="[\u:\d \t @\w]$ [\!]>; "
you get a number which is the line number of your history file.