.. 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()
    print(dates)





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

 .. code-block:: none

    ['2004-06-15T22:15:13.842235000' '1978-10-12T12:26:42.392722000'
     '2018-06-08T16:09:20.417184000' ... '1975-07-20T04:59:17.432479000'
     '1973-10-08T07:13:16.558973000' '1970-02-06T21:33:13.977613000']




.. 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([(2004,  6, 15), (1978, 10, 12), (2018,  6,  8), ...,
           (1975,  7, 20), (1973, 10,  8), (1970,  2,  6)],
          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([(22, 15, 13), (12, 26, 42), (16,  9, 20), ..., ( 4, 59, 17),
           ( 7, 13, 16), (21, 33, 13)],
          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([(2004, 25, 2), (1978, 41, 4), (2018, 23, 5), ..., (1975, 29, 7),
           (1973, 41, 1), (1970,  6, 5)],
          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, 4, 5, ..., 0, 1, 5], 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([14422513842235000, 24582402392722000, 13709360417184000, ...,
           17297957432479000, 24217996558973000,  3187993977613000],
          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(2004, 6, 15, 22, 15, 13, 842235),
           datetime.datetime(1978, 10, 12, 12, 26, 42, 392722),
           datetime.datetime(2018, 6, 8, 16, 9, 20, 417184), ...,
           datetime.datetime(1975, 7, 20, 4, 59, 17, 432479),
           datetime.datetime(1973, 10, 8, 7, 13, 16, 558973),
           datetime.datetime(1970, 2, 6, 21, 33, 13, 977613)], dtype=object)




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

   **Total running time of the script:** (0 minutes 0.030 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>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: ex_dateutils.zip <ex_dateutils.zip>`


.. only:: html

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

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