Pandas DateOffset, step back one day
<p>I try to understand why </p>

<pre><code>print(pd.Timestamp("2015-01-01") - pd.DateOffset(day=1))
</code></pre>

<p>does not result in</p>

<pre><code>pd.Timestamp("2014-12-31")
</code></pre>

<p>I am using Pandas 0.18. I run within the CET timezone.</p>