astropy_plot_dates_issue.ipynb

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    {
     "ename": "AssertionError",
     "evalue": "\nNot equal to tolerance rtol=1e-07, atol=0\n\nMismatched elements: 1 / 1 (100%)\nMax absolute difference: 719163.\nMax relative difference: 38.77011406\n x: array(737712.416667)\n y: array(18549.416667)",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mAssertionError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-3-d431215d0067>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m     14\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     15\u001b[0m \u001b[0;31m# Compare astropy.Time.plot_date with matplotlib.dates.date2num result\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 16\u001b[0;31m \u001b[0massert_quantity_allclose\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mt_astropy\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mplot_date\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mdate2num\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mt_datetime\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;32m~/.virtualenvs/2020-10-14/lib/python3.8/site-packages/astropy/tests/helper.py\u001b[0m in \u001b[0;36massert_quantity_allclose\u001b[0;34m(actual, desired, rtol, atol, **kwargs)\u001b[0m\n\u001b[1;32m    480\u001b[0m     \u001b[0;32mimport\u001b[0m \u001b[0mnumpy\u001b[0m \u001b[0;32mas\u001b[0m \u001b[0mnp\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    481\u001b[0m     \u001b[0;32mfrom\u001b[0m \u001b[0mastropy\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0munits\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mquantity\u001b[0m \u001b[0;32mimport\u001b[0m \u001b[0m_unquantify_allclose_arguments\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m--> 482\u001b[0;31m     np.testing.assert_allclose(*_unquantify_allclose_arguments(\n\u001b[0m\u001b[1;32m    483\u001b[0m         actual, desired, rtol, atol), **kwargs)\n",
      "    \u001b[0;31m[... skipping hidden 2 frame]\u001b[0m\n",
      "\u001b[0;31mAssertionError\u001b[0m: \nNot equal to tolerance rtol=1e-07, atol=0\n\nMismatched elements: 1 / 1 (100%)\nMax absolute difference: 719163.\nMax relative difference: 38.77011406\n x: array(737712.416667)\n y: array(18549.416667)"
     ]
    }
   ],
   "source": [
    "from datetime import datetime\n",
    "from matplotlib.dates import num2date, date2num\n",
    "from astropy.time import Time\n",
    "from astropy.tests.helper import assert_quantity_allclose\n",
    "\n",
    "# ISO 8601-formatted timestamp\n",
    "t_str = '2020-10-14T10:00:00'\n",
    "\n",
    "# Create astropy.time.Time object from string\n",
    "t_astropy = Time(t_str)\n",
    "\n",
    "# Create datetime.datetime object from string\n",
    "t_datetime = datetime.fromisoformat(t_str)\n",
    "\n",
    "# Compare astropy.Time.plot_date with matplotlib.dates.date2num result\n",
    "assert_quantity_allclose(t_astropy.plot_date, date2num(t_datetime))"
   ]
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   "execution_count": null,
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   "source": []
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requirements.txt

git+https://github.com/astropy/astropy@04e218ce85ae42e90d1f7e15840cbb61d44646e4#egg=astropy
matplotlib
numpy
pytest