title: Draw a frequency plot in d3 with JSON data
body: <p>I am doing a project in d3 and am at my wits' end on how to draw a frequency graph for graphing tweets. So, basically, I have a JSON file whose format is like this</p>
  
  <pre>
  {
      "text": "some text here",
      "time": "timestamp here",
      "timezone": "timezone here",
      "retweet_count": some number,
      "hashtags": "some text here"
  }
  </pre>
  
  <p>So, now I need to draw a graph in d3 which shows the number of tweets in a particular time period. For example, between date X and date Y, the graph shows how many tweets were there per day.</p>
  
  <p>Can someone help me out with this? I'm really very new to d3.</p>