title: Generating 15 minute time interval array in python
body: <p>I am trying to generate time interval array. for example:</p>
  
  <pre><code>time_array = ["2016-09-02T17:30:00Z", "2016-09-02T17:45:00Z", 
                "2016-09-02T18:00:00Z", "2016-09-02T18:15:00Z", 
                "2016-09-02T18:30:00Z", "2016-09-02T18:45:00Z"]
  </code></pre>
  
  <ol>
  <li>It should create the element like above in zulu time till 9 pm everyday.</li>
  <li>Should generate the elements for next and day after next as well</li>
  <li>Start time from 7:00 am - Ed time 9:00 pm,
  if current_time is > start_time then generate 15 min time interval array till 9 pm. and then generate for next day and day + 2.
  And Interval should be 7:00, 7:15 like that.. not in 7:12, 8:32</li>
  </ol>