Though The question is already answered and accepted, but I still want to suggest trying using bash-it.
It has numerous themes, aliases and completion support for several languages and frameworks, including git, rails, svn and many others.
Installation
Download the zip archive from here https://github.com/Bash-it/bash-it/archive/master.zip and extract it in a folder .bash_it. This folder would be a hidden folder for starting with a dot(.).
Run ~/.bash_it/install.sh (it automatically backs up your ~/.bash_profile or ~/.bashrc, depending on your OS)
Edit your modified config ~/.bashrc file in order to customize Bash-it.
For example if you want to use the Slick theme you'd change the line 8 of ~/.bashrc file to
export BASH_IT_THEME='slick'
The Themes are in ~/.bash_it/themes/ directory.
The available themes screenshot can be viewed here. https://github.com/Bash-it/bash-it/wiki/Themes
Alternatively, you can preview all of them in your shell using the command
BASH_PREVIEW=true reload
You can start using them by doing command
source ~/.bash_it/themes/<theme-name>/<theme-name>.theme.bash
'bobby' theme has a prompt with time included, try using it. You can also customize them.