The main purpose of this package is to provide more complex arithmetic operations on dates/times. Heavy use is made of the relativedelta type from Labix's dateutil library. Much of this package is just a light wrapper on top of this with some added features such as range generation and business day calculation.

You should install dateutils with pip:

pip install dateutils

Otherwise, you'll have to download the package and run:

python setup.py install

If you install it this way then you will also have to install all necessary dependencies manually.