title: Convert Date to MongoDB ISO Date
body: <p>I have a date that is in this format in my MongoDB database. </p>
  
  <pre><code>{
        "_id": ObjectId("5682e899f326d45c821d8b9b"),
        "City": "Atlanta",
        "Date": "12/5/02",
        "Temp": 78.5,
  }
  </code></pre>
  
  <p>I would like to convert this to ISO date so I could sort on date in my database. What would be the best way to do this with an update command with PyMongo or JavaScript. </p>