title: How to get python dictionaries into a pandas time series dataframe where key is date object
body: <p>I have a python dictionaries where the key is a dateobject and the value is the timeseires.</p>
  
  <pre><code>   timeseries = {datetime.datetime(2013, 3, 17, 18, 19): {'t2': 400, 't1': 1000},
                   datetime.datetime(2013, 3, 17, 18, 20): {'t2': 300, 't1': 3000}
                  }
  </code></pre>
  
  <p>How to I get this time series into a pandas dataframe?</p>