title: Why does subtracting two UTC timestamps give "subtraction must have the same timezones or no timezones"?
body: <p>I am trying to compare a Pandas datetime to a Python datetime.</p>
  
  <p>The code</p>
  
  <pre><code>cur_t = pandas.Timestamp.utcnow()
  </code></pre>
  
  <p>Gives:</p>
  
  <pre><code>Timestamp('2019-02-14 14:31:40.283415+0000', tz='UTC')
  </code></pre>
  
  <p>And the code</p>
  
  <pre><code>data_t=indata.data.loc[2000].last_time
  </code></pre>
  
  <p>Gives:</p>
  
  <pre><code>Timestamp('2019-02-14 14:28:32+0000', tz='UTC')
  </code></pre>
  
  <p>However, subtracting data_t from cur_t gives <code>TypeError: Timestamp subtraction must have the same timezones or no timezones</code></p>
  
  <p>What is going on here? Why can't andas compare two times with the same timezone?</p>