Does anyone understand this error?
<blockquote>
  <p>ValueError: Error parsing datetime string "2015-01-31:00:00" at position 10</p>
</blockquote>

<p>I am trying to call <code>np.datetime64('2015-01-31:00:00')</code>. </p>

<p>A date in <code>ms</code> gives an idea of the string format it accepts</p>

<pre><code>In [74]: np.datetime64('2015-01-31','ms')
Out[74]: numpy.datetime64('2015-01-31T00:00:00.000')
</code></pre>

<p>See also the examples on the <code>numpy</code> doc page</p>

<p><a href="http://docs.scipy.org/doc/numpy/reference/arrays.datetime.html" rel="nofollow">http://docs.scipy.org/doc/numpy/reference/arrays.datetime.html</a></p>

<p>Space also works</p>

<pre><code>In [79]: np.datetime64('2015-01-31 00:00:00','ms')
Out[79]: numpy.datetime64('2015-01-31T00:00:00.000')
</code></pre>

python datetime numpy