title: Create minutely date_time range using Pandas
body: <p>I want to create a time range with a sample every 2.5 minutes, where I know the start time and number of samples.</p>
  
  <p>Here is code to get 1000 timestamps separated by 5 minutes starting from a given day:</p>
  
  <pre><code>date = pandas.date_range(datetime(2015, 12, 25, hour=12, minute=0),
                           periods=1000, freq='5min')
  </code></pre>
  
  <p>How can I specify a 2 min 30 sec frequency?</p>