Dates
=====

Save all functions into the same file named  :file:`dates.py`.

#. Write the function :py:func:`age` that takes the birth date of a
   person and the present date, and returns the age of the
   person. Each date is represented with three integers
   (:py:class:`int`): day, month and year. Example:

   .. literalinclude:: dates1.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`dates1.txt<dates1.txt>` file.
   
#. Write the function :py:func:`complete_year` that takes a year and a
   century. The value of the year is between 0 and 99, and returns the
   complete year computed by adding the century to the year. Example:

   .. literalinclude:: dates2.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`dates2.txt<dates2.txt>` file.
   
#. Write the function :py:func:`age_21` that takes the same parameters
   as function :py:func:`age`, and returns the age of the person. This
   function :py:func:`age_21` has to deal with completely represented
   years (as 1976 or 2003) or with years represented without the
   century. We will suppose that the years without century (between 0
   and 99) are from the XXI century. This function must call the
   previous functions :py:func:`age` and :py:func:`complete_year`. Example:

   .. literalinclude:: dates3.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`dates3.txt<dates3.txt>` file.

#. Write the function :py:func:`compare_dates` that takes 6 integers
   `day1`, `mont1`, `year1`, `day2`, `month2` and `year2`, that
   represent two dates, and returns -1 if the first date is previous to the
   second date, 0 if they are the same date and 1 if the first date is
   later to the second one. Example:

   .. literalinclude:: dates4.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`dates4.txt<dates4.txt>` file.
   
#. Write the functions :py:func:`previous_date`, :py:func:`same_date`
   and :py:func:`later_date` that take two dates each, and return
   `True` if the first date is previous, equal or later to the second
   one respectively. Otherwise they return `False`. You must call
   function :py:func:`compare_dates`. Example:

   .. literalinclude:: dates5.txt
      :language: python3
      :lines: 3-11
   
   .. note::
      More tests are provided in the :download:`dates5.txt<dates5.txt>` file.
   
.. rubric:: Solutions

A solution of these functions is provided in the
:download:`dates.py<solutions/dates.py>` file.