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Matplotlib provides sophisticated date plotting capabilities, standing
on the shoulders of python :mod:`datetime`, the add-on modules
:mod:`pytz` and :mod:`dateutils`.  :class:`datetime` objects are
converted to floating point numbers which represent time in days
since 0001-01-01 UTC, plus 1.  For example, 0001-01-01, 06:00 is
1.25, not 0.25.  The helper functions :func:`date2num`,
:func:`num2date` and :func:`drange` are used to facilitate easy
conversion to and from :mod:`datetime` and numeric ranges.

.. note::
   Like Python's datetime, mpl uses the Gregorian calendar for
   all conversions between dates and floating point numbers.
   This practice is not universal, and calendar differences can
   cause confusing differences between what Python and mpl
   give as the number of days since 0001-01-01 and what other
   software and databases yield.  For example, the
   `US Naval Observatory <http://www.usno.navy.mil/USNO/astronomical-applications/data-services/jul-date>`_
   uses a calendar that switches from Julian to Gregorian in
   October, 1582.  Hence, using their calculator, the number of
   days between 0001-01-01 and 2006-04-01 is 732403, whereas using
   the Gregorian calendar via the datetime module we find::

     In [31]:date(2006,4,1).toordinal() - date(1,1,1).toordinal()
     Out[31]:732401


A wide range of specific and general purpose date tick locators and
formatters are provided in this module.  See
:mod:`matplotlib.ticker` for general information on tick locators
and formatters.  These are described below.

All the matplotlib date converters, tickers and formatters are
timezone aware, and the default timezone is given by the timezone
parameter in your :file:`matplotlibrc` file.  If you leave out a
:class:`tz` timezone instance, the default from your rc file will be
assumed.  If you want to use a custom time zone, pass a
:class:`pytz.timezone` instance with the tz keyword argument to
:func:`num2date`, :func:`plot_date`, and any custom date tickers or
locators you create.  See `pytz <http://pytz.sourceforge.net>`_ for
information on :mod:`pytz` and timezone handling.

The `dateutil module <http://labix.org/python-dateutil>`_ provides
additional code to handle date ticking, making it easy to place ticks
on any kinds of dates.  See examples below.

Date tickers
------------

Most of the date tickers can locate single or multiple values.  For
example::

    # tick on mondays every week
    loc = WeekdayLocator(byweekday=MO, tz=tz)

    # tick on mondays and saturdays
    loc = WeekdayLocator(byweekday=(MO, SA))

In addition, most of the constructors take an interval argument::

    # tick on mondays every second week
    loc = WeekdayLocator(byweekday=MO, interval=2)

The rrule locator allows completely general date ticking::

    # tick every 5th easter
    rule = rrulewrapper(YEARLY, byeaster=1, interval=5)
    loc = RRuleLocator(rule)

Here are all the date tickers:

    * :class:`MinuteLocator`: locate minutes

    * :class:`HourLocator`: locate hours

    * :class:`DayLocator`: locate specifed days of the month

    * :class:`WeekdayLocator`: Locate days of the week, eg MO, TU

    * :class:`MonthLocator`: locate months, eg 7 for july

    * :class:`YearLocator`: locate years that are multiples of base

    * :class:`RRuleLocator`: locate using a
      :class:`matplotlib.dates.rrulewrapper`.  The
      :class:`rrulewrapper` is a simple wrapper around a
      :class:`dateutils.rrule` (`dateutil
      <https://moin.conectiva.com.br/DateUtil>`_) which allow almost
      arbitrary date tick specifications.  See `rrule example
      <../examples/pylab_examples/date_demo_rrule.html>`_.

    * :class:`AutoDateLocator`: On autoscale, this class picks the best
      :class:`MultipleDateLocator` to set the view limits and the tick
      locations.

Date formatters
---------------

Here all all the date formatters:

    * :class:`AutoDateFormatter`: attempts to figure out the best format
      to use.  This is most useful when used with the :class:`AutoDateLocator`.

    * :class:`DateFormatter`: use :func:`strftime` format strings

    * :class:`IndexDateFormatter`: date plots with implicit *x*
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