.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/ex_dateutils.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_auto_examples_ex_dateutils.py>`
        to download the full example code or to run this example in your browser via Binder

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_ex_dateutils.py:


********************
Numpy date utilities
********************

This library provides utility functions to perform conversions and get
information about numpy dates quickly.

.. GENERATED FROM PYTHON SOURCE LINES 10-29

.. code-block:: Python

    import datetime
    import random

    import numpy

    import pyinterp


    def make_date(samples=10000):
        """Generates random dates."""
        epoch = datetime.datetime(1970, 1, 1)
        delta = datetime.datetime.now() - datetime.datetime(1970, 1, 1)

        pydates = [epoch + random.random() * delta for _ in range(samples)]
        npdates = numpy.array(pydates).astype('datetime64[ns]')

        return npdates









.. GENERATED FROM PYTHON SOURCE LINES 30-33

.. code-block:: Python

    dates = make_date()
    dates





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array(['2017-06-13T07:13:05.648487000', '1978-06-25T11:48:48.603000000',
           '1998-01-25T14:05:15.643924000', ...,
           '2003-12-29T04:12:31.934470000', '2007-06-19T07:28:11.876077000',
           '1987-01-27T19:55:41.243390000'], dtype='datetime64[ns]')



.. GENERATED FROM PYTHON SOURCE LINES 34-36

Get the date part as a structured numpy array of three fields: ``year``,
``month`` and ``day``:

.. GENERATED FROM PYTHON SOURCE LINES 36-38

.. code-block:: Python

    pyinterp.dateutils.date(dates)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([(2017,  6, 13), (1978,  6, 25), (1998,  1, 25), ...,
           (2003, 12, 29), (2007,  6, 19), (1987,  1, 27)],
          dtype=[('year', '<i4'), ('month', '<u4'), ('day', '<u4')])



.. GENERATED FROM PYTHON SOURCE LINES 39-41

Get the time part as a structured numpy array of three fields: ``hour``,
``minute`` and ``second``:

.. GENERATED FROM PYTHON SOURCE LINES 41-43

.. code-block:: Python

    pyinterp.dateutils.time(dates)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([( 7, 13,  5), (11, 48, 48), (14,  5, 15), ..., ( 4, 12, 31),
           ( 7, 28, 11), (19, 55, 41)],
          dtype=[('hour', '<u4'), ('minute', '<u4'), ('second', '<u4')])



.. GENERATED FROM PYTHON SOURCE LINES 44-46

Get the ISO calendar of the date as a structured numpy array of three fields:
``year``, ``weekday`` and ``week``:

.. GENERATED FROM PYTHON SOURCE LINES 46-48

.. code-block:: Python

    pyinterp.dateutils.isocalendar(dates)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([(2017, 24, 2), (1978, 25, 7), (1998,  4, 7), ..., (2004,  1, 1),
           (2007, 25, 2), (1987,  5, 2)],
          dtype=[('year', '<i4'), ('week', '<u4'), ('weekday', '<u4')])



.. GENERATED FROM PYTHON SOURCE LINES 49-50

Get the week day of the dates (Sunday is 0 ... Saturday is 6):

.. GENERATED FROM PYTHON SOURCE LINES 50-52

.. code-block:: Python

    pyinterp.dateutils.weekday(dates)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([2, 0, 0, ..., 1, 2, 2], dtype=uint32)



.. GENERATED FROM PYTHON SOURCE LINES 53-54

Get the timedelta from since January

.. GENERATED FROM PYTHON SOURCE LINES 54-56

.. code-block:: Python

    pyinterp.dateutils.timedelta_since_january(dates)





.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([14109185648487000, 15162528603000000,  2124315643924000, ...,
           31291951934470000, 14628491876077000,  2318141243390000],
          dtype='timedelta64[ns]')



.. GENERATED FROM PYTHON SOURCE LINES 57-58

Get the dates as datetime.datetime array

.. GENERATED FROM PYTHON SOURCE LINES 58-59

.. code-block:: Python

    pyinterp.dateutils.datetime(dates)




.. rst-class:: sphx-glr-script-out

 .. code-block:: none


    array([datetime.datetime(2017, 6, 13, 7, 13, 5, 648487),
           datetime.datetime(1978, 6, 25, 11, 48, 48, 603000),
           datetime.datetime(1998, 1, 25, 14, 5, 15, 643924), ...,
           datetime.datetime(2003, 12, 29, 4, 12, 31, 934470),
           datetime.datetime(2007, 6, 19, 7, 28, 11, 876077),
           datetime.datetime(1987, 1, 27, 19, 55, 41, 243390)], dtype=object)




.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.041 seconds)


.. _sphx_glr_download_auto_examples_ex_dateutils.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: binder-badge

      .. image:: images/binder_badge_logo.svg
        :target: https://mybinder.org/v2/gh/CNES/pangeo-pyinterp/master?urlpath=lab/tree/notebooks/auto_examples/ex_dateutils.ipynb
        :alt: Launch binder
        :width: 150 px

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: ex_dateutils.ipynb <ex_dateutils.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: ex_dateutils.py <ex_dateutils.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_