title: Dart datetime difference in weeks, month and years
body: <p>I was working on a project and wanted to add the difference in DateTime in terms of minutes, hours, days, weeks, months and years. I was able to get in minutes up to days. e.g.</p>
  
  <pre><code>DateTime.now().difference(DateTime(2019, 10, 7)).inDays
  </code></pre>
  
  <p>But I had a hard time creating it for weeks, months and years. How can I do so, please help</p>