Difference between two dates in Pandas DataFrame
<p>I have many columns in a data frame and I have to find the difference of time in two column named as <code>in_time</code> and <code>out_time</code> and put it in the new column in the same data frame.</p>

<p>The format of time is like this <code>2015-09-25T01:45:34.372Z</code>.</p>

<p>I am using Pandas DataFrame.</p>

<p>I want to do like this:</p>

<pre><code>df.days = df.out_time - df.in_time
</code></pre>

<p><br>
I have many columns and I have to increase 1 more column in it named days and put the differences there.</p>